18639012 has 36 divisors (see below), whose sum is σ = 50593200. Its totient is φ = 5325264.

The previous prime is 18638999. The next prime is 18639013. The reversal of 18639012 is 21093681.

It is a super-2 number, since 2×18639012² = 694825536672288, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18639013) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15262 + ... + 16437.

Almost surely, 2^18639012 is an apocalyptic number.

18639012 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18639012 is an abundant number, since it is smaller than the sum of its proper divisors (31954188).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18639012 is a wasteful number, since it uses less digits than its factorization.

18639012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31720 (or 31711 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 30.

The square root of 18639012 is about 4317.2922069279. The cubic root of 18639012 is about 265.1394163756.

The spelling of 18639012 in words is "eighteen million, six hundred thirty-nine thousand, twelve".