Brewer's: An Abundant Number

A number such that the sum of all its divisors (except itself) is greater than the number itself. Thus 12 is an abundant number, because its divisors, 1, 2, 3, 4, 6 = 16, which is greater than 12.

A Deficient number is one of which the sum of all its divisors is less than itself, as 10, the divisors of which are 1, 2, 5 = 8, which is less than 10.

A Perfect number is one of which the sum of all its divisors exactly measures itself, as 6, the divisors of which are 1, 2, 3 = 6.

Related Content Allusions Foreign Words and Phrases Latin and Greek Word Elements Names: Their Origins and Meanings Old Testament Names Mythology Ancient Greek Literature & Mythology The Bible (King James version) The Koran (translation by J. M. Rodwell) Shakespeare's Plays Tales from Shakespeare (Charles and Mary Lamb) Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language