Is 405 a deficient number and what is its deficiency?

Is 405 a deficient number?

Here we will explain and calculate if 405 is a deficient number and its deficiency if applicable.

405 is a deficient number if the sum of its proper divisors is less than 405.

The sum of its proper divisors is calculated as follows: 1 + 3 + 5 + 9 + 15 + 27 + 45 + 81 + 135 = 321.

321 is less than 405. Therefore, 405 is a deficient number.

The deficiency of 405 is 405 minus the sum of its proper divisors. Thus, the deficiency of 405 is 405 - 321 = 84

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