Usually means: Sum of divisors less than number.
Definitions Related words Mentions
We found 13 dictionaries that define the word deficient number:

General (8 matching dictionaries)
  1. deficient number: Merriam-Webster
  2. deficient number: Wordnik
  3. deficient number: Wiktionary
  4. deficient number: Infoplease Dictionary
  5. Deficient number, deficient number: Dictionary.com
  6. Deficient number: Wikipedia, the Free Encyclopedia
  7. deficient number: FreeDictionary.org
  8. Deficient number: TheFreeDictionary.com

Computing (1 matching dictionary)
  1. deficient number: Encyclopedia

Science (4 matching dictionaries)
  1. A Glossary of Mathematical Terms (No longer online)
  2. Deficient Number: Eric Weisstein's World of Mathematics
  3. deficient number: PlanetMath Encyclopedia
  4. deficient number, deficient number: Prime

Definitions from Wiktionary (deficient number)

noun:  (number theory) A number that is greater than the sum of all of its divisors except itself.

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