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The fascinating world of numbers

Number 40 - properties and curiosities

40 (number)

40

Number 40 properties

  • Harshad
  • 40 is an even number.
  • 40 is a Harshad number, which means it is divisible by the sum of its digits (40 = 4, and 40 is divisible by 4).

Prime factorization

Prime factorization of 40: 2^3 × 5.

Divisors

Divisor count: 8

1, 2, 4, 5, 8, 10, 20, 40

Factors of 40 are: 1, 2, 4, 5, 8, 10, 20, 40.

Representations

In octal, 40 is represented as 50.

In binary, 40 is represented as 101000.

In hex, 40 is represented as 28.

Roman numeral: XL

Curiosities

  • 40 is divisible by the sum of its digits.

Quick answers

Is 40 prime?
No, 40 is not prime.

What are the factors of 40?
1, 2, 4, 5, 8, 10, 20, 40

What is 40 in binary?
101000