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deficient number
noun maths

or defective number

  1. From our crowdsourced Open Dictionary
    a number is called dificient if the sum of its proper divisors is less than the number itself

    9 is a deficient number because 1+3 (proper divisors of 9) = 4, which is less than 9.

    Submitted by Samuel Chung from Mexico on 02/10/2018

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