18043944 has 32 divisors (see below), whose sum is σ = 45222720. Its totient is φ = 5999616.

The previous prime is 18043943. The next prime is 18043981. The reversal of 18043944 is 44934081.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18043943) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13197 + ... + 14499.

It is an arithmetic number, because the mean of its divisors is an integer number (1413210).

Almost surely, 2^18043944 is an apocalyptic number.

It is an amenable number.

18043944 is an abundant number, since it is smaller than the sum of its proper divisors (27178776).

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

18043944 is a wasteful number, since it uses less digits than its factorization.

18043944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1889 (or 1885 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 33.

The square root of 18043944 is about 4247.8163802123. The cubic root of 18043944 is about 262.2872362122.

The spelling of 18043944 in words is "eighteen million, forty-three thousand, nine hundred forty-four".