18638512 has 20 divisors (see below), whose sum is σ = 36210976. Its totient is φ = 9293760.

The previous prime is 18638509. The next prime is 18638519. The reversal of 18638512 is 21583681.

It is not an unprimeable number, because it can be changed into a prime (18638519) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 5353 + ... + 8119.

Almost surely, 2^18638512 is an apocalyptic number.

It is an amenable number.

18638512 is a deficient number, since it is larger than the sum of its proper divisors (17572464).

18638512 is a wasteful number, since it uses less digits than its factorization.

18638512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3196 (or 3190 counting only the distinct ones).

The product of its digits is 11520, while the sum is 34.

The square root of 18638512 is about 4317.2342998730. The cubic root of 18638512 is about 265.1370455258.

The spelling of 18638512 in words is "eighteen million, six hundred thirty-eight thousand, five hundred twelve".