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.
Words nearby deficient 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. 2019