18282272 has 12 divisors (see below), whose sum is σ = 35993286. Its totient is φ = 9141120.

The previous prime is 18282203. The next prime is 18282283. The reversal of 18282272 is 27228281.

It can be written as a sum of positive squares in only one way, i.e., 10010896 + 8271376 = 3164^2 + 2876^2 .

It is a Harshad number since it is a multiple of its sum of digits (32), and also a Moran number because the ratio is a prime number: 571321 = 18282272 / (1 + 8 + 2 + 8 + 2 + 2 + 7 + 2).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 285629 + ... + 285692.

Almost surely, 2^18282272 is an apocalyptic number.

It is an amenable number.

18282272 is a deficient number, since it is larger than the sum of its proper divisors (17711014).

18282272 is an equidigital number, since it uses as much as digits as its factorization.

18282272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 571331 (or 571323 counting only the distinct ones).

The product of its digits is 7168, while the sum is 32.

The square root of 18282272 is about 4275.7773562242. Note that the first 3 decimals coincide. The cubic root of 18282272 is about 263.4369696586.

The spelling of 18282272 in words is "eighteen million, two hundred eighty-two thousand, two hundred seventy-two".