18686368 has 24 divisors (see below), whose sum is σ = 36932868. Its totient is φ = 9306624.

The previous prime is 18686357. The next prime is 18686377. The reversal of 18686368 is 86368681.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 15904144 + 2782224 = 3988^2 + 1668^2 .

It is a Smith number, since the sum of its digits (46) coincides with the sum of the digits of its prime factors.

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, 8380 + ... + 10372.

Almost surely, 2^18686368 is an apocalyptic number.

It is an amenable number.

18686368 is a deficient number, since it is larger than the sum of its proper divisors (18246500).

18686368 is a wasteful number, since it uses less digits than its factorization.

18686368 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2296 (or 2288 counting only the distinct ones).

The product of its digits is 331776, while the sum is 46.

The square root of 18686368 is about 4322.7731839642. The cubic root of 18686368 is about 265.3637723946.

The spelling of 18686368 in words is "eighteen million, six hundred eighty-six thousand, three hundred sixty-eight".