18398975 has 12 divisors (see below), whose sum is σ = 26074224. Its totient is φ = 12616320.

The previous prime is 18398957. The next prime is 18398977. The reversal of 18398975 is 57989381.

It is not a de Polignac number, because 18398975 - 2⁶ = 18398911 is a prime.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18398977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 52394 + ... + 52743.

It is an arithmetic number, because the mean of its divisors is an integer number (2172852).

Almost surely, 2^18398975 is an apocalyptic number.

18398975 is a deficient number, since it is larger than the sum of its proper divisors (7675249).

18398975 is a wasteful number, since it uses less digits than its factorization.

18398975 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105154 (or 105149 counting only the distinct ones).

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

The square root of 18398975 is about 4289.4026390629. The cubic root of 18398975 is about 263.9963220715.

The spelling of 18398975 in words is "eighteen million, three hundred ninety-eight thousand, nine hundred seventy-five".