40 is a positive integer between 39 and 41.

Properties Edit

40 is an even composite number.

40 is equal to 10!!!!!!, the sextuple factorial of 10.

40 is the 4th decagonal number.

In googology Edit

In Greek-based number-naming systems, 40 is associated with prefix "tetraconta-", and with prefix "quadraginti-" in Latin systems.

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