18639364 has 6 divisors (see below), whose sum is σ = 32618894. Its totient is φ = 9319680.

The previous prime is 18639353. The next prime is 18639377. The reversal of 18639364 is 46393681.

It can be written as a sum of positive squares in only one way, i.e., 13764100 + 4875264 = 3710^2 + 2208^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2329917 + ... + 2329924.

Almost surely, 2^18639364 is an apocalyptic number.

It is an amenable number.

18639364 is a deficient number, since it is larger than the sum of its proper divisors (13979530).

18639364 is a wasteful number, since it uses less digits than its factorization.

18639364 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4659845 (or 4659843 counting only the distinct ones).

The product of its digits is 93312, while the sum is 40.

The square root of 18639364 is about 4317.3329730286. The cubic root of 18639364 is about 265.1410854284.

The spelling of 18639364 in words is "eighteen million, six hundred thirty-nine thousand, three hundred sixty-four".