18389444 has 24 divisors (see below), whose sum is σ = 35000280. Its totient is φ = 8418816.

The previous prime is 18389401. The next prime is 18389453. The reversal of 18389444 is 44498381.

It can be written as a sum of positive squares in 4 ways, for example, as 8340544 + 10048900 = 2888^2 + 3170^2 .

It is a Smith number, since the sum of its digits (41) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1139 + ... + 6170.

It is an arithmetic number, because the mean of its divisors is an integer number (1458345).

Almost surely, 2^18389444 is an apocalyptic number.

It is an amenable number.

18389444 is a deficient number, since it is larger than the sum of its proper divisors (16610836).

18389444 is a wasteful number, since it uses less digits than its factorization.

18389444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7367 (or 7365 counting only the distinct ones).

The product of its digits is 110592, while the sum is 41.

The square root of 18389444 is about 4288.2915012858. The cubic root of 18389444 is about 263.9507292501.

The spelling of 18389444 in words is "eighteen million, three hundred eighty-nine thousand, four hundred forty-four".