# sociable number

Definition from Wiktionary, the free dictionary

## English[edit]

### Noun[edit]

**sociable number** (*plural* **sociable numbers**)

- (number theory) Any of a sequence of numbers having the property that the sum of the divisors of each, excluding itself, is equal to the next number in the sequence; in the case of the last number of the sequence, the sum of the divisors, excluding that number, is equal to the first number of the sequence.
*The numbers in the sequence <1264460, 1547860, 1727636, 1305184> are***sociable numbers**.