The Natural Number 40

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Properties of the Number 40

• Because 40 is divisible by 2 ...
• 40 is an even number
• 40 has parity 0
• 40 is not an odd number

• Because 40 can be factored as 2 x 20 ...
• 40 is a composite number
• 40 is not a prime number

Alternative Representations of the Number 40

• Base 2 (binary): 101000
• Base 8 (octal): 50
• Base 16 (hexadecimal): 28

• Roman numeral: XL

• Words: forty

Divisors of the Number 40

• 40 has 8 positive divisors: 1, 2, 4, 5, 8, 10, 20, 40
• The sum of the positive divisors is 90
• 40 has 7 proper divisors: 1, 2, 4, 5, 8, 10, 20
• The sum of the proper divisors is 50

• 40 is not a deficient number
• 40 is not a perfect number
• 40 is an abundant number since the sum of the proper divisors is greater than 40

More Properties of the Number 40

• 40 is not a square number
• 40 is not a cube number

• 40 is not a palindromic number

• 40 is not a Fibonacci number
• 40 is not a Lucas number