18881944 has 8 divisors (see below), whose sum is σ = 35403660. Its totient is φ = 9440968.

The previous prime is 18881909. The next prime is 18881957. The reversal of 18881944 is 44918881.

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 18881944.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1180114 + ... + 1180129.

Almost surely, 2^18881944 is an apocalyptic number.

It is an amenable number.

18881944 is a deficient number, since it is larger than the sum of its proper divisors (16521716).

18881944 is a wasteful number, since it uses less digits than its factorization.

18881944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2360249 (or 2360245 counting only the distinct ones).

The product of its digits is 73728, while the sum is 43.

The square root of 18881944 is about 4345.3358903542. The cubic root of 18881944 is about 266.2863481274.

The spelling of 18881944 in words is "eighteen million, eight hundred eighty-one thousand, nine hundred forty-four".