18225868 has 6 divisors (see below), whose sum is σ = 31895276. Its totient is φ = 9112932.

The previous prime is 18225859. The next prime is 18225869. The reversal of 18225868 is 86852281.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 18225868.

It is not an unprimeable number, because it can be changed into a prime (18225869) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2278230 + ... + 2278237.

Almost surely, 2^18225868 is an apocalyptic number.

It is an amenable number.

18225868 is a deficient number, since it is larger than the sum of its proper divisors (13669408).

18225868 is a wasteful number, since it uses less digits than its factorization.

18225868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4556471 (or 4556469 counting only the distinct ones).

The product of its digits is 61440, while the sum is 40.

The square root of 18225868 is about 4269.1765013876. The cubic root of 18225868 is about 263.1657742286.

The spelling of 18225868 in words is "eighteen million, two hundred twenty-five thousand, eight hundred sixty-eight".