18439944 has 32 divisors (see below), whose sum is σ = 46660320. Its totient is φ = 6071936.

The previous prime is 18439921. The next prime is 18439961. The reversal of 18439944 is 44993481.

It is a junction number, because it is equal to n+sod(n) for n = 18439896 and 18439905.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2637 + ... + 6620.

It is an arithmetic number, because the mean of its divisors is an integer number (1458135).

Almost surely, 2^18439944 is an apocalyptic number.

It is an amenable number.

18439944 is an abundant number, since it is smaller than the sum of its proper divisors (28220376).

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

18439944 is a wasteful number, since it uses less digits than its factorization.

18439944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9349 (or 9345 counting only the distinct ones).

The product of its digits is 124416, while the sum is 42.

The square root of 18439944 is about 4294.1755902618. The cubic root of 18439944 is about 264.1921236943.

The spelling of 18439944 in words is "eighteen million, four hundred thirty-nine thousand, nine hundred forty-four".