Numbers / 747

The Number 747

747 is composite: factorization 3^2 × 83. That gives 747 exactly 6 divisors: 1, 3, 9, 83, 249, 747. 747's proper divisors total just 345, 402 short of 747, the deficient case most of 747's neighbors share too. 747 is also a palindrome, since 747 reads identically forwards and backwards. 747 has a digit sum of 18; for 747, the digital root works out to 9. 747: 3, 9 all divide 747 evenly, out of 2-12. 747 is 1011101011 in binary and 2EB in hex; as a Roman numeral it's DCCXLVII.