diff --git a/boa_engine/src/builtins/error/aggregate.rs b/boa_engine/src/builtins/error/aggregate.rs
index 6a7e212fe8..8bbf117384 100644
--- a/boa_engine/src/builtins/error/aggregate.rs
+++ b/boa_engine/src/builtins/error/aggregate.rs
@@ -56,7 +56,7 @@ impl BuiltIn for AggregateError {
 
 impl AggregateError {
     /// The amount of arguments this function object takes.
-    pub(crate) const LENGTH: usize = 1;
+    pub(crate) const LENGTH: usize = 2;
 
     /// Create a new aggregate error object.
     pub(crate) fn constructor(
diff --git a/boa_engine/src/builtins/number/mod.rs b/boa_engine/src/builtins/number/mod.rs
index 1c84fc27e9..2529452f3b 100644
--- a/boa_engine/src/builtins/number/mod.rs
+++ b/boa_engine/src/builtins/number/mod.rs
@@ -17,7 +17,8 @@ use crate::{
     builtins::{string::is_trimmable_whitespace, BuiltIn, JsArgs},
     context::StandardObjects,
     object::{
-        internal_methods::get_prototype_from_constructor, ConstructorBuilder, JsObject, ObjectData,
+        internal_methods::get_prototype_from_constructor, ConstructorBuilder, FunctionBuilder,
+        JsObject, ObjectData,
     },
     property::Attribute,
     value::{AbstractRelation, IntegerOrInfinity, JsValue},
@@ -49,6 +50,18 @@ impl BuiltIn for Number {
     fn init(context: &mut Context) -> JsValue {
         let _timer = Profiler::global().start_event(Self::NAME, "init");
 
+        let parse_int = FunctionBuilder::native(context, Self::parse_int)
+            .name("parseInt")
+            .length(2)
+            .constructor(false)
+            .build();
+
+        let parse_float = FunctionBuilder::native(context, Self::parse_float)
+            .name("parseFloat")
+            .length(1)
+            .constructor(false)
+            .build();
+
         let attribute = Attribute::READONLY | Attribute::NON_ENUMERABLE | Attribute::PERMANENT;
         let number_object = ConstructorBuilder::with_standard_object(
             context,
@@ -65,20 +78,39 @@ impl BuiltIn for Number {
         .static_property("NEGATIVE_INFINITY", f64::NEG_INFINITY, attribute)
         .static_property("POSITIVE_INFINITY", f64::INFINITY, attribute)
         .static_property("NaN", f64::NAN, attribute)
+        .static_property(
+            "parseInt",
+            parse_int.clone(),
+            Attribute::WRITABLE | Attribute::NON_ENUMERABLE | Attribute::CONFIGURABLE,
+        )
+        .static_property(
+            "parseFloat",
+            parse_float.clone(),
+            Attribute::WRITABLE | Attribute::NON_ENUMERABLE | Attribute::CONFIGURABLE,
+        )
+        .static_method(Self::number_is_finite, "isFinite", 1)
+        .static_method(Self::number_is_nan, "isNaN", 1)
+        .static_method(Self::is_safe_integer, "isSafeInteger", 1)
+        .static_method(Self::number_is_integer, "isInteger", 1)
         .method(Self::to_exponential, "toExponential", 1)
         .method(Self::to_fixed, "toFixed", 1)
         .method(Self::to_locale_string, "toLocaleString", 0)
         .method(Self::to_precision, "toPrecision", 1)
         .method(Self::to_string, "toString", 1)
         .method(Self::value_of, "valueOf", 0)
-        .static_method(Self::number_is_finite, "isFinite", 1)
-        .static_method(Self::number_is_nan, "isNaN", 1)
-        .static_method(Self::is_safe_integer, "isSafeInteger", 1)
-        .static_method(Self::number_is_integer, "isInteger", 1)
         .build();
 
-        context.register_global_builtin_function("parseInt", 2, Self::parse_int);
-        context.register_global_builtin_function("parseFloat", 1, Self::parse_float);
+        context.register_global_property(
+            "parseInt",
+            parse_int,
+            Attribute::WRITABLE | Attribute::NON_ENUMERABLE | Attribute::CONFIGURABLE,
+        );
+        context.register_global_property(
+            "parseFloat",
+            parse_float,
+            Attribute::WRITABLE | Attribute::NON_ENUMERABLE | Attribute::CONFIGURABLE,
+        );
+
         context.register_global_builtin_function("isFinite", 1, Self::global_is_finite);
         context.register_global_builtin_function("isNaN", 1, Self::global_is_nan);
 
diff --git a/boa_engine/src/builtins/reflect/mod.rs b/boa_engine/src/builtins/reflect/mod.rs
index 87cd25d043..95d5c7d657 100644
--- a/boa_engine/src/builtins/reflect/mod.rs
+++ b/boa_engine/src/builtins/reflect/mod.rs
@@ -56,7 +56,7 @@ impl BuiltIn for Reflect {
             .function(Self::own_keys, "ownKeys", 1)
             .function(Self::prevent_extensions, "preventExtensions", 1)
             .function(Self::set, "set", 3)
-            .function(Self::set_prototype_of, "setPrototypeOf", 3)
+            .function(Self::set_prototype_of, "setPrototypeOf", 2)
             .property(
                 to_string_tag,
                 Self::NAME,