18042636 has 24 divisors (see below), whose sum is σ = 42434560. Its totient is φ = 5966352.

The previous prime is 18042599. The next prime is 18042653. The reversal of 18042636 is 63624081.

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 in 7 ways as a sum of consecutive naturals, for example, 4396 + ... + 7443.

Almost surely, 2^18042636 is an apocalyptic number.

It is an amenable number.

18042636 is an abundant number, since it is smaller than the sum of its proper divisors (24391924).

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

18042636 is a wasteful number, since it uses less digits than its factorization.

18042636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11973 (or 11971 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 30.

The square root of 18042636 is about 4247.6624159648. The cubic root of 18042636 is about 262.2808983518.

The spelling of 18042636 in words is "eighteen million, forty-two thousand, six hundred thirty-six".