deficient number
- 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.
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Compare abundant number, perfect number.
Origin of deficient number
First recorded in 1720–30
Also called defective number.
Dictionary.com Unabridged
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018