Numbers / 439

The Number 439

439 is prime: only 1 and 439 divide it evenly; the next prime after 439 is 443. 439's proper divisors total just 1, 438 short of 439, the deficient case most of 439's neighbors share too. 439 has a digit sum of 16; for 439, the digital root works out to 7. 439 shares no factor with 2-12; 439's own divisors start beyond that range. 439 is 110110111 in binary and 1B7 in hex; as a Roman numeral it's CDXXXIX.