Numbers / 863

The Number 863

863 is prime: only 1 and 863 divide it evenly; the next prime after 863 is 877. 863's proper divisors total just 1, 862 short of 863, the deficient case most of 863's neighbors share too. 863 has a digit sum of 17; for 863, the digital root works out to 8. 863 shares no factor with 2-12; 863's own divisors start beyond that range. 863 is 1101011111 in binary and 35F in hex; as a Roman numeral it's DCCCLXIII.