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42 (number) facts for kids

Kids Encyclopedia Facts
41 42 43
Cardinal forty-two
Ordinal 42nd
Factorization 2 · 3 · 7
Roman numeral XLII
Binary 1010102
Ternary 11203
Quaternary 2224
Quinary 1325
Senary 1106
Octal 528
Duodecimal 3612
Hexadecimal 2A16
Vigesimal 2220
Base 36 1636

Forty-two is a number. It comes between forty-one and forty-three, and is an even number. It is divisible by 1, 2, 3, 6, 7, 14, 21, and 42.

42 is an extremely interesting number to mathematicians, because of its many features. For example:

  1. It is the product of two consecutive integers (6 and 7), making it a pronic number.
  2. It is the second sphenic number, the product of three distinct prime numbers.
  3. It is an abundant number, the sum of its proper divisors is greater than the number itself.

There are at least a dozen more features of interest to number theory enthusiasts.

Appearance in literature

"42" is the "Answer to the Ultimate Question of Life, the Universe, and Everything" in Douglas Adams' The Hitchhiker's Guide to the Galaxy books.

The number makes regular appearances in Lewis Carroll's writings, such as in The Hunting of the Snark. Rule Forty-two in Alice's Adventures in Wonderland is "All persons more than a mile high to leave the court". Charles Dodgson was a mathematician.

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