18689864 has 16 divisors (see below), whose sum is σ = 35859120. Its totient is φ = 9127440.

The previous prime is 18689849. The next prime is 18689873. The reversal of 18689864 is 46898681.

It is a happy number.

It is a super-2 number, since 2×18689864² = 698622032676992, which contains 22 as substring.

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, 26822 + ... + 27509.

It is an arithmetic number, because the mean of its divisors is an integer number (2241195).

Almost surely, 2^18689864 is an apocalyptic number.

It is an amenable number.

18689864 is a deficient number, since it is larger than the sum of its proper divisors (17169256).

18689864 is a wasteful number, since it uses less digits than its factorization.

18689864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54380 (or 54376 counting only the distinct ones).

The product of its digits is 663552, while the sum is 50.

The square root of 18689864 is about 4323.1775351008. The cubic root of 18689864 is about 265.3803201778.

The spelling of 18689864 in words is "eighteen million, six hundred eighty-nine thousand, eight hundred sixty-four".