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Number Prototype Methods

Number.prototype.valueOf()

Returns the primitive value of the specified object. Called automatically when the object is treated as a primitive other than a string, it overrides the Object.prototype.valueOf()method.

Number.prototype.toExponential()

Returns a string representing the number in exponential notation.

Number.prototype.toFixed()

Returns a string representing the number in fixed-point notation.

Number.prototype.toPrecision()

Returns a string representing the number to a specified precision in fixed-point or exponential notation.

Number.prototype.toString()

Returns a string representing the specified object in the specified radix (base). The inverse function is parseInt(s,r). This function is also called automatically when the object is treated as a string.

Number.prototype.toLocaleString()

Returns a string with a language sensitive representation of this number. Overrides the Object.prototype.toLocaleString() method.(Refer to 6.20 for related information on Intl.)

toString() can be used to convert the base of a number to an artrary radix.
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<!DOCTYPE html><html><body><script>


   var n = 123.456;
   console.log(n.valueOf());           // 123.456
   console.log(n.toExponential());  // 1.23456e+2
   console.log(n.toExponential(4)); // 1.2346e+2
   console.log(n.toFixed());            // 123
   console.log(n.toFixed(4));          // 123.4560
   console.log(n.toPrecision());       // 123.456
   console.log(n.toPrecision(4));     // 123.5
   console.log(n.toString()+999);   // 123.456999
   console.log(n.toString(16));       // 7b.74bc6a7ef9dc
   console.log((1234567).toLocaleString()); // 1,234,567
   console.log((123.4).toLocaleString(
                         "zh-Hans-CN-u-nu-hanidec")); // 一二三.四
   console.log((2500).toLocaleString("en-GB", {style:
          "currency", currency: "GBP", minimumFractionDigits: 2}));   //£2,500.00

</script></body><html>