18868686 has 16 divisors (see below), whose sum is σ = 37876944. Its totient is φ = 6266304.

The previous prime is 18868669. The next prime is 18868693. The reversal of 18868686 is 68686881.

It is a happy number.

It is a super-2 number, since 2×18868686² = 712054622733192, 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 7 ways as a sum of consecutive naturals, for example, 4015 + ... + 7338.

It is an arithmetic number, because the mean of its divisors is an integer number (2367309).

Almost surely, 2^18868686 is an apocalyptic number.

18868686 is an abundant number, since it is smaller than the sum of its proper divisors (19008258).

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

18868686 is a wasteful number, since it uses less digits than its factorization.

18868686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11635.

The product of its digits is 884736, while the sum is 51.

The square root of 18868686 is about 4343.8100787212. The cubic root of 18868686 is about 266.2240090126.

The spelling of 18868686 in words is "eighteen million, eight hundred sixty-eight thousand, six hundred eighty-six".