---
tag: 0MXFJ0J00R
kind: concept
name: Deficient number
msc: [11A25]
sources:
  - url: https://en.wikipedia.org/wiki/Deficient_number
    locator: lead section
same_as:
  wikidata: Q467511
  wikipedia: Deficient number
---

## Summary

A deficient number is a positive integer whose positive divisors other than itself have a sum less than the number.
The [[definition of a deficient number|0G01TS1RRP]] gives the precise form.