Numbers / 900

The Number 900

900 is composite: factorization 2^2 × 3^2 × 5^2. That gives 900 exactly 27 divisors: 1, 2, 3, 4, 5, 6, 9, 10, 12, 15, 18, 20, 25, 30, 36, 45, 50, 60, 75, 90, 100, 150, 180, 225, 300, 450, 900. 900's proper divisors total 1921, 1021 more than 900 itself, so 900 is abundant. 900 is also a perfect square, since 30² = 900. 900 has a digit sum of 9; for 900, the digital root works out to 9. 900: 2, 3, 4, 5, 6, 9, 10, 12 all divide 900 evenly, out of 2-12. 900 is 1110000100 in binary and 384 in hex; as a Roman numeral it's CM.