18557116 has 12 divisors (see below), whose sum is σ = 32562432. Its totient is φ = 9253568.

The previous prime is 18557101. The next prime is 18557131. The reversal of 18557116 is 61175581.

It is an interprime number because it is at equal distance from previous prime (18557101) and next prime (18557131).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4525 + ... + 7588.

It is an arithmetic number, because the mean of its divisors is an integer number (2713536).

Almost surely, 2^18557116 is an apocalyptic number.

It is an amenable number.

18557116 is a deficient number, since it is larger than the sum of its proper divisors (14005316).

18557116 is a wasteful number, since it uses less digits than its factorization.

18557116 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12500 (or 12498 counting only the distinct ones).

The product of its digits is 8400, while the sum is 34.

The square root of 18557116 is about 4307.7971168568. The cubic root of 18557116 is about 264.7505234883.

The spelling of 18557116 in words is "eighteen million, five hundred fifty-seven thousand, one hundred sixteen".