Numbers / 457

The Number 457

457 is prime: only 1 and 457 divide it evenly; the next prime after 457 is 461. 457's proper divisors total just 1, 456 short of 457, the deficient case most of 457's neighbors share too. 457 has a digit sum of 16; for 457, the digital root works out to 7. 457 shares no factor with 2-12; 457's own divisors start beyond that range. 457 is 111001001 in binary and 1C9 in hex; as a Roman numeral it's CDLVII.