18166944 has 24 divisors (see below), whose sum is σ = 47688480. Its totient is φ = 6055616.

The previous prime is 18166943. The next prime is 18166979. The reversal of 18166944 is 44966181.

18166944 is nontrivially palindromic in base 13.

It is a tau number, because it is divible by the number of its divisors (24).

It is not an unprimeable number, because it can be changed into a prime (18166943) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 94524 + ... + 94715.

It is an arithmetic number, because the mean of its divisors is an integer number (1987020).

Almost surely, 2^18166944 is an apocalyptic number.

It is an amenable number.

18166944 is an abundant number, since it is smaller than the sum of its proper divisors (29521536).

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

18166944 is a wasteful number, since it uses less digits than its factorization.

18166944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 189252 (or 189244 counting only the distinct ones).

The product of its digits is 41472, while the sum is 39.

The square root of 18166944 is about 4262.2698178318. The cubic root of 18166944 is about 262.8818641796.

It can be divided in two parts, 18166 and 944, that added together give a triangular number (19110 = T₁₉₅).

The spelling of 18166944 in words is "eighteen million, one hundred sixty-six thousand, nine hundred forty-four".