Numbers / 853

The Number 853

853 is prime: only 1 and 853 divide it evenly; the next prime after 853 is 857. 853's proper divisors total just 1, 852 short of 853, the deficient case most of 853's neighbors share too. 853 has a digit sum of 16; for 853, the digital root works out to 7. 853 shares no factor with 2-12; 853's own divisors start beyond that range. 853 is 1101010101 in binary and 355 in hex; as a Roman numeral it's DCCCLIII.