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12 (twelve) is a positive integer following 11 and preceding 13. Its ordinal form is written "12th" or "twelfth".


Properties

  • 12 is an even composite number, and the 3rd Superior Highly Composite number (SHCN).
  • 12 is the smallest number with six divisors.
  • 12 is the first abundant number.
  • 12 is the second semiperfect number.
  • 12 is a friendly number.
  • A set of 12 objects is often called a dozen. That type of set gets its own name because many things are grouped in twelve: for example, twelve months in a year, twelve inches in a foot, twelve eggs in a typical container, etc.
  • There are 12 size-3 Latin squares.

In googology

  • In Greek-based number-naming systems, 12 is associated with prefix "dodeka-", and with prefix "duodeci-" in Latin systems.

Twelve.png

In the Czech and Slovak languages, 12 is called tucet.

See also

Sources

  1. Part 1 (LAN) - Aarex Googology (archived 2017-02-25)
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