18938975 has 24 divisors (see below), whose sum is σ = 26062320. Its totient is φ = 13536000.

The previous prime is 18938971. The next prime is 18938977. The reversal of 18938975 is 57983981.

It is not a de Polignac number, because 18938975 - 2² = 18938971 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18938971) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16211 + ... + 17339.

It is an arithmetic number, because the mean of its divisors is an integer number (1085930).

Almost surely, 2^18938975 is an apocalyptic number.

18938975 is a deficient number, since it is larger than the sum of its proper divisors (7123345).

18938975 is a wasteful number, since it uses less digits than its factorization.

18938975 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1211 (or 1206 counting only the distinct ones).

The product of its digits is 544320, while the sum is 50.

The square root of 18938975 is about 4351.8932661544. The cubic root of 18938975 is about 266.5541756436.

The spelling of 18938975 in words is "eighteen million, nine hundred thirty-eight thousand, nine hundred seventy-five".