deficient number

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noun Mathematics.

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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Also called defective number.

Compare abundant number, perfect number.

Origin of deficient number

First recorded in 1720–30

Words nearby deficient number

deficiency, deficiency account, deficiency disease, deficiency judgment, deficient, deficient number, deficit, deficit financing, deficit spending, de fide, defied