Numbers / 829

The Number 829

829 is prime: only 1 and 829 divide it evenly; the next prime after 829 is 839. 829's proper divisors total just 1, 828 short of 829, the deficient case most of 829's neighbors share too. 829 has a digit sum of 19; for 829, the digital root works out to 1. 829 shares no factor with 2-12; 829's own divisors start beyond that range. 829 is 1100111101 in binary and 33D in hex; as a Roman numeral it's DCCCXXIX.