18287225 has 12 divisors (see below), whose sum is σ = 24738000. Its totient is φ = 13299600.

The previous prime is 18287221. The next prime is 18287249. The reversal of 18287225 is 52278281.

It is not a de Polignac number, because 18287225 - 2² = 18287221 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18287221) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 32975 + ... + 33524.

It is an arithmetic number, because the mean of its divisors is an integer number (2061500).

Almost surely, 2^18287225 is an apocalyptic number.

It is an amenable number.

18287225 is a deficient number, since it is larger than the sum of its proper divisors (6450775).

18287225 is a wasteful number, since it uses less digits than its factorization.

18287225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66520 (or 66515 counting only the distinct ones).

The product of its digits is 17920, while the sum is 35.

The square root of 18287225 is about 4276.3565099276. The cubic root of 18287225 is about 263.4607574660.

The spelling of 18287225 in words is "eighteen million, two hundred eighty-seven thousand, two hundred twenty-five".