Numbers / 787

The Number 787

787 is prime: only 1 and 787 divide it evenly; the next prime after 787 is 797. 787's proper divisors total just 1, 786 short of 787, the deficient case most of 787's neighbors share too. 787 is also a palindrome, since 787 reads identically forwards and backwards. 787 has a digit sum of 22; for 787, the digital root works out to 4. 787 shares no factor with 2-12; 787's own divisors start beyond that range. 787 is 1100010011 in binary and 313 in hex; as a Roman numeral it's DCCLXXXVII.