The Natural Number 4

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Properties of the Number 4

  • Because 4 is divisible by 2 ...
    • 4 is an even number
    • 4 has parity 0
    • 4 is not an odd number
  • Because 4 can be factored as 2 x 2 ...
    • 4 is a composite number
    • 4 is not a prime number

Alternative Representations of the Number 4

  • Base 2 (binary): 100
  • Base 8 (octal): 4
  • Base 16 (hexadecimal): 4
  • Roman numeral: IV
  • Words: four

Divisors of the Number 4

  • 4 has 3 positive divisors: 1, 2, 4
    • The sum of the positive divisors is 7
  • 4 has 2 proper divisors: 1, 2
    • The sum of the proper divisors is 3
  • 4 is a deficient number since the sum of the proper divisors is less than 4
  • 4 is not a perfect number
  • 4 is not an abundant number

More Properties of the Number 4

  • 4 is a square number (i.e., square of the natural number 2)
  • 4 is not a cube number
  • 4 is a palindromic number (i.e., the digits are the same forwards and backwards)
  • 4 is not a Fibonacci number
  • 4 is a Lucas number

6:33 pm, Thursday, March 30, 2017 (UTC; +0000)
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