18889618 has 24 divisors (see below), whose sum is σ = 32846544. Its totient is φ = 8078400.

The previous prime is 18889603. The next prime is 18889631. The reversal of 18889618 is 81698881.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4873 + ... + 7843.

It is an arithmetic number, because the mean of its divisors is an integer number (1368606).

Almost surely, 2^18889618 is an apocalyptic number.

18889618 is a deficient number, since it is larger than the sum of its proper divisors (13956926).

18889618 is a wasteful number, since it uses less digits than its factorization.

18889618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3018 (or 3001 counting only the distinct ones).

The product of its digits is 221184, while the sum is 49.

The square root of 18889618 is about 4346.2188163966. The cubic root of 18889618 is about 266.3224179421.

The spelling of 18889618 in words is "eighteen million, eight hundred eighty-nine thousand, six hundred eighteen".