18685317 has 24 divisors (see below), whose sum is σ = 29366400. Its totient is φ = 10535616.

The previous prime is 18685313. The next prime is 18685319. The reversal of 18685317 is 71358681.

It is not a de Polignac number, because 18685317 - 2² = 18685313 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18685313) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10809 + ... + 12417.

It is an arithmetic number, because the mean of its divisors is an integer number (1223600).

Almost surely, 2^18685317 is an apocalyptic number.

It is an amenable number.

18685317 is a deficient number, since it is larger than the sum of its proper divisors (10681083).

18685317 is a wasteful number, since it uses less digits than its factorization.

18685317 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1705 (or 1698 counting only the distinct ones).

The product of its digits is 40320, while the sum is 39.

The square root of 18685317 is about 4322.6516167741. The cubic root of 18685317 is about 265.3587972428.

The spelling of 18685317 in words is "eighteen million, six hundred eighty-five thousand, three hundred seventeen".