JavaScript Number Properties

Beginner

⏱️ 6 min read

📚 Updated: Jul 2026

🎯 8 Tutorials

Static constants

Overview

What You’ll Learn

JavaScript Number properties are static constants that describe floating-point limits and precision. This hub indexes 8 tutorials with examples and try-it labs.

Static

On Number

Read-only

Constants

EPSILON

Near 1

Equality

Tolerances

Safe

Baseline

8 guides

Growing

Fundamentals

Introduction

JavaScript Number static properties are read-only constants on Number itself — for example Number.EPSILON, Number.MAX_SAFE_INTEGER, Number.POSITIVE_INFINITY, and Number.NaN. Access them as Number.NaN, not on a number instance like (1).NaN.

Start with Number.EPSILON to learn why floating-point math needs a tiny tolerance near magnitude 1 — and when a larger tolerance is safer.

Quick peek

👀 Not-A-Number

NaN never equals itself — detect it with Number.isNaN:

Number.NaN → NaN Number.NaN === Number.NaN → false Number.isNaN(Number.NaN) → true

Number Properties Index

Search by property name or browse by category. Each tutorial includes syntax, five try-it examples, and FAQs.

Search Number properties

Static Properties

8 tutorials

Read-only constants on Number itself — floating-point limits, special values, and precision helpers.

Property	Description	Tutorial
`EPSILON`	Static constant: the difference between 1 and the next representable Number — used as a tiny tolerance near magnitude 1.	Open
`MAX_VALUE`	Static constant: the largest positive finite Number (~1.8e+308) — larger results become Infinity.	Open
`MIN_VALUE`	Static constant: the smallest positive Number (~5e-324) — smaller results underflow toward 0.	Open
`MAX_SAFE_INTEGER`	Static constant: the largest exact integer Number (2^53 − 1) — beyond it, use BigInt.	Open
`MIN_SAFE_INTEGER`	Static constant: the smallest exact integer Number (−(2^53 − 1)) — below it, use BigInt.	Open
`POSITIVE_INFINITY`	Static constant: positive Infinity — same as global Infinity; appears after overflow past MAX_VALUE.	Open
`NEGATIVE_INFINITY`	Static constant: negative Infinity — same as -Infinity; appears after overflow past -MAX_VALUE.	Open
`NaN`	Static constant: Not-A-Number — same as global NaN; never equals itself (use Number.isNaN).	Open

❓ Frequently Asked Questions

What are JavaScript Number properties?

Number properties are static constants on the Number object — values you read, not functions you call. Examples: Number.EPSILON, Number.MAX_SAFE_INTEGER, Number.POSITIVE_INFINITY, and Number.NaN.

How is a Number property different from a Number method?

Methods are functions: (5).toFixed(2) or Number.parseFloat(s). Properties are constants you read without parentheses: Number.NaN. You do not write Number.NaN().

What should I learn first?

Start with Number.EPSILON for floating-point equality, Number.MAX_VALUE / MIN_VALUE for magnitude limits, MAX_SAFE_INTEGER / MIN_SAFE_INTEGER for exact integers, POSITIVE_INFINITY / NEGATIVE_INFINITY for signed Infinity, and Number.NaN for Not-A-Number.

Are Number properties writable?

Built-in static Number properties such as Number.EPSILON and Number.NaN are not writable, not enumerable, and not configurable in modern engines.

Where are Number method tutorials?

Open the Number Methods hub for toString(), toFixed(), isFinite(), isSafeInteger(), parseInt(), parseFloat(), and more.

Where are the property tutorials?

Open EPSILON, MAX_VALUE, MIN_VALUE, MAX_SAFE_INTEGER, MIN_SAFE_INTEGER, POSITIVE_INFINITY, NEGATIVE_INFINITY, or NaN from the index below for syntax, five try-it labs each, and FAQs.