Nearby Numbers

Positive, nonzero integers within three units

37

Thirty-Seven

38

Thirty-Eight

39

Thirty-Nine

41

Forty-One

42

Forty-Two

43

Forty-Three

Scientific Notation

Scientific notation expresses a quantity as the product of its significand with 10 raised to an integer exponent.

4e1

Reciprocal

A number multiplied with its reciprocal is one.

0.025

The reciprocal of 40.

Palindrome?

A numerical palindrome has the same value when all of its digits are reversed.

The number 40 is not a palindrome.

Not A Prime Number

A prime number is a positive integer that is divisible only by itself and one.

Forty is a composite number with 8 total factors (including 1 and itself).   See primes in Base 10 Decimal

A Composite

Composites have more than just these two factors.

Forty is a composite number with 8 total factors (including 1 and itself).

Prime Factors

2

Two

5

Five

Prime Factorization

The prime factorization of a positive integer is the unique list of prime factors together with their multiplicities

23 · 51 = 40

Base Conversions

The number forty in 35 different bases