18018904 has 16 divisors (see below), whose sum is σ = 33874200. Its totient is φ = 8985792.

The previous prime is 18018901. The next prime is 18018911. The reversal of 18018904 is 40981081.

It is a super-2 number, since 2×18018904² = 649361802722432, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18018901) 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 in 3 ways as a sum of consecutive naturals, for example, 519 + ... + 6025.

Almost surely, 2^18018904 is an apocalyptic number.

It is an amenable number.

18018904 is a deficient number, since it is larger than the sum of its proper divisors (15855296).

18018904 is a wasteful number, since it uses less digits than its factorization.

18018904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5922 (or 5918 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 31.

The square root of 18018904 is about 4244.8679602551. The cubic root of 18018904 is about 262.1658526836.

Adding to 18018904 its reverse (40981081), we get a palindrome (58999985).

The spelling of 18018904 in words is "eighteen million, eighteen thousand, nine hundred four".