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 Everyday Examples
 Deficient Number:  A number in which the sum of all its proper divisors is less than the number itself.
Example of Deficient Numbers

The number 16 has proper divisors 1, 2, 4, and 8. The sum of the proper divisors is 15 which makes 16 a deficient number.

Non-Examples of Deficient Numbers

The number 18 has proper divisors 1, 2, 3, 6 and 9. The sum of the proper divisors is 21 which is greater than 18. Thus, 18 is not a deficient number, but is actually an abundant number.

The number 6 has proper divisors 1, 2, and 3. The sum of these proper divisors is 6 which is not less than 6 but equal to 6. Thus, 6 is not a deficient number. It's a perfect number!