Is 909 a deficient number and what is its deficiency?

Is 909 a deficient number?

Here we will explain and calculate if 909 is a deficient number and its deficiency if applicable.

909 is a deficient number if the sum of its proper divisors is less than 909.

The sum of its proper divisors is calculated as follows: 1 + 3 + 9 + 101 + 303 = 417.

417 is less than 909. Therefore, 909 is a deficient number.

The deficiency of 909 is 909 minus the sum of its proper divisors. Thus, the deficiency of 909 is 909 - 417 = 492

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