18638144 has 28 divisors (see below), whose sum is σ = 42269664. Its totient is φ = 7987584.

The previous prime is 18638131. The next prime is 18638177. The reversal of 18638144 is 44183681.

It is a tau number, because it is divible by the number of its divisors (28).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20354 + ... + 21249.

Almost surely, 2^18638144 is an apocalyptic number.

18638144 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

18638144 is an abundant number, since it is smaller than the sum of its proper divisors (23631520).

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

18638144 is an equidigital number, since it uses as much as digits as its factorization.

18638144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41622 (or 41612 counting only the distinct ones).

The product of its digits is 18432, while the sum is 35.

The square root of 18638144 is about 4317.1916797844. The cubic root of 18638144 is about 265.1353005533.

The spelling of 18638144 in words is "eighteen million, six hundred thirty-eight thousand, one hundred forty-four".