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Meaning of deficient number

defi'cient num'ber

Pronunciation: [key]
— Math. Math.
  1. a positive number that is greater than the sum of all positive integers that are submultiples of it, as 10, which is greater than the sum of 1, 2, and 5. Also calledCf. abundant number, perfect number.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.