18444172 has 12 divisors (see below), whose sum is σ = 32328856. Its totient is φ = 9207360.

The previous prime is 18444169. The next prime is 18444211. The reversal of 18444172 is 27144481.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 573 + ... + 6100.

Almost surely, 2^18444172 is an apocalyptic number.

It is an amenable number.

18444172 is a deficient number, since it is larger than the sum of its proper divisors (13884684).

18444172 is a wasteful number, since it uses less digits than its factorization.

18444172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7368 (or 7366 counting only the distinct ones).

The product of its digits is 7168, while the sum is 31.

The square root of 18444172 is about 4294.6678567731. The cubic root of 18444172 is about 264.2123139027.

The spelling of 18444172 in words is "eighteen million, four hundred forty-four thousand, one hundred seventy-two".