Is 1815 a deficient number and what is its deficiency?

Is 1815 a deficient number?

Here we will explain and calculate if 1815 is a deficient number and its deficiency if applicable.

1815 is a deficient number if the sum of its proper divisors is less than 1815.

The sum of its proper divisors is calculated as follows: 1 + 3 + 5 + 11 + 15 + 33 + 55 + 121 + 165 + 363 + 605 = 1377.

1377 is less than 1815. Therefore, 1815 is a deficient number.

The deficiency of 1815 is 1815 minus the sum of its proper divisors. Thus, the deficiency of 1815 is 1815 - 1377 = 438

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