18664136 has 8 divisors (see below), whose sum is σ = 34995270. Its totient is φ = 9332064.

The previous prime is 18664073. The next prime is 18664153. The reversal of 18664136 is 63146681.

It can be written as a sum of positive squares in only one way, i.e., 18541636 + 122500 = 4306^2 + 350^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 18664096 and 18664105.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1166501 + ... + 1166516.

Almost surely, 2^18664136 is an apocalyptic number.

It is an amenable number.

18664136 is a deficient number, since it is larger than the sum of its proper divisors (16331134).

18664136 is a wasteful number, since it uses less digits than its factorization.

18664136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2333023 (or 2333019 counting only the distinct ones).

The product of its digits is 20736, while the sum is 35.

The square root of 18664136 is about 4320.2009212535. The cubic root of 18664136 is about 265.2584922853.

The spelling of 18664136 in words is "eighteen million, six hundred sixty-four thousand, one hundred thirty-six".