Numbers / 743

The Number 743

743 is prime: only 1 and 743 divide it evenly; the next prime after 743 is 751. 743's proper divisors total just 1, 742 short of 743, the deficient case most of 743's neighbors share too. 743 has a digit sum of 14; for 743, the digital root works out to 5. 743 shares no factor with 2-12; 743's own divisors start beyond that range. 743 is 1011100111 in binary and 2E7 in hex; as a Roman numeral it's DCCXLIII.