


Description 



Deficient Number: A number in which the sum of all its proper divisors is less than the number itself. 
The word deficient means to lack in some way. A deficient
number is lacking in the sense that the sum of its proper divisors (all its
positive divisors excluding itself) is less than the number itself. For example, 9 is a deficient number because the sum of its proper divisors is 1 + 3 = 4, and 4 is less than 9.


