deficient number

deficient number

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.
Also called defective number.


Origin:
1720–30
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Deficient number is always a great word to know.
So is mean value. Does it mean:
the ratio of the integral of a given function over a closed interval to the length of the interval
the process of replacing a number by another number of approximately the same value but having fewer digits
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