18117636 has 24 divisors (see below), whose sum is σ = 42344064. Its totient is φ = 6029280.

The previous prime is 18117611. The next prime is 18117647. The reversal of 18117636 is 63671181.

It is a junction number, because it is equal to n+sod(n) for n = 18117597 and 18117606.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12021 + ... + 13443.

It is an arithmetic number, because the mean of its divisors is an integer number (1764336).

Almost surely, 2^18117636 is an apocalyptic number.

It is an amenable number.

18117636 is an abundant number, since it is smaller than the sum of its proper divisors (24226428).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18117636 is a wasteful number, since it uses less digits than its factorization.

18117636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2491 (or 2489 counting only the distinct ones).

The product of its digits is 6048, while the sum is 33.

The square root of 18117636 is about 4256.4816456787. The cubic root of 18117636 is about 262.6438141656.

The spelling of 18117636 in words is "eighteen million, one hundred seventeen thousand, six hundred thirty-six".