18444975 has 24 divisors (see below), whose sum is σ = 30628992. Its totient is φ = 9794400.

The previous prime is 18444967. The next prime is 18444989. The reversal of 18444975 is 57944481.

It is not a de Polignac number, because 18444975 - 2³ = 18444967 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 24454 + ... + 25196.

It is an arithmetic number, because the mean of its divisors is an integer number (1276208).

Almost surely, 2^18444975 is an apocalyptic number.

18444975 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

18444975 is a deficient number, since it is larger than the sum of its proper divisors (12184017).

18444975 is a wasteful number, since it uses less digits than its factorization.

18444975 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1087 (or 1082 counting only the distinct ones).

The product of its digits is 161280, while the sum is 42.

The square root of 18444975 is about 4294.7613437769. The cubic root of 18444975 is about 264.2161481655.

The spelling of 18444975 in words is "eighteen million, four hundred forty-four thousand, nine hundred seventy-five".