18228

18228, read as eighteen thousand two hundred twenty-eight, is a natural number that sits between 18227 and 18229. In mathematics, its prime factorization is 2^2 × 3 × 7^2 × 31, which means the number has 36 positive divisors. It is an even, composite number, with factors arising from the 2^2 and 7^2 components.

The sum of all divisors of 18228 is 51072, so the sum of its proper divisors is 32844. The number is a Harshad (Niven) number in base 10, since the sum of its digits equals 1 + 8 + 2 + 2 + 8 = 21 and 18228 ÷ 21 = 868. The digits also give a digital root of 3, and 18228 is congruent to 3 modulo 9.

As a five-digit integer, 18228 may appear in various practical contexts as an identifier or code, such as a postal code, catalog number, or other designation. The mathematical properties described here are inherent to the number itself and not tied to any single usage.