Numbers / 866

The Number 866

866 is composite: factorization 2 × 433. That gives 866 exactly 4 divisors: 1, 2, 433, 866. 866's proper divisors total just 436, 430 short of 866, the deficient case most of 866's neighbors share too. 866 has a digit sum of 20; for 866, the digital root works out to 2. 866: 2 all divide 866 evenly, out of 2-12. 866 is 1101100010 in binary and 362 in hex; as a Roman numeral it's DCCCLXVI.