


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.
NonExamples 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!


