18081744 has 40 divisors (see below), whose sum is σ = 49461120. Its totient is φ = 5672448.

The previous prime is 18081733. The next prime is 18081751. The reversal of 18081744 is 44718081.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10264 + ... + 11895.

It is an arithmetic number, because the mean of its divisors is an integer number (1236528).

Almost surely, 2^18081744 is an apocalyptic number.

It is an amenable number.

18081744 is an abundant number, since it is smaller than the sum of its proper divisors (31379376).

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

18081744 is a wasteful number, since it uses less digits than its factorization.

18081744 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22187 (or 22181 counting only the distinct ones).

The product of its (nonzero) digits is 7168, while the sum is 33.

The square root of 18081744 is about 4252.2633972980. The cubic root of 18081744 is about 262.4702623909.

The spelling of 18081744 in words is "eighteen million, eighty-one thousand, seven hundred forty-four".