# almost perfect number

> natural number whose proper divisors sum to one less than itself

**Wikidata**: [Q1526045](https://www.wikidata.org/wiki/Q1526045)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Almost_perfect_number)  
**Source**: https://4ort.xyz/entity/almost-perfect-number


## References

1. Freebase Data Dumps. 2013