deficient number
mathematics
Quick Summary
A deficient number is a type of imperfect number where the sum of its divisors is less than the number itself. For example, the number 8 is a deficient number because its divisors (1, 2, and 4) sum to 7, which is less than 8. Another term for a deficient number is a defective number.12
Summary created from Britannica articles
using AI.
AI can make mistakes, so verify using Britannica articles.
2 Britannica Sources
Ask Britannica AI about this topic
Britannica doesn't have a full article on this topic, so we've curated a list of our relevant coverage.