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deficient number

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noun Mathematics.
  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.
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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