18855944 has 32 divisors (see below), whose sum is σ = 36295680. Its totient is φ = 9180864.

The previous prime is 18855937. The next prime is 18855953. The reversal of 18855944 is 44955881.

It is a super-2 number, since 2×18855944² = 711093248262272, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 18855895 and 18855904.

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, 67934 + ... + 68210.

It is an arithmetic number, because the mean of its divisors is an integer number (1134240).

Almost surely, 2^18855944 is an apocalyptic number.

It is an amenable number.

18855944 is a deficient number, since it is larger than the sum of its proper divisors (17439736).

18855944 is a wasteful number, since it uses less digits than its factorization.

18855944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 477 (or 473 counting only the distinct ones).

The product of its digits is 230400, while the sum is 44.

The square root of 18855944 is about 4342.3431462748. The cubic root of 18855944 is about 266.1640686049.

The spelling of 18855944 in words is "eighteen million, eight hundred fifty-five thousand, nine hundred forty-four".