18685686 has 32 divisors (see below), whose sum is σ = 40940640. Its totient is φ = 5659136.

The previous prime is 18685673. The next prime is 18685717. The reversal of 18685686 is 68658681.

It is a happy number.

It is a super-2 number, since 2×18685686² = 698309722581192, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 201 + ... + 6116.

It is an arithmetic number, because the mean of its divisors is an integer number (1279395).

Almost surely, 2^18685686 is an apocalyptic number.

18685686 is an abundant number, since it is smaller than the sum of its proper divisors (22254954).

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

18685686 is a wasteful number, since it uses less digits than its factorization.

18685686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6368.

The product of its digits is 552960, while the sum is 48.

The square root of 18685686 is about 4322.6942986984. The cubic root of 18685686 is about 265.3605440109.

The spelling of 18685686 in words is "eighteen million, six hundred eighty-five thousand, six hundred eighty-six".