18397975 has 6 divisors (see below), whose sum is σ = 22813520. Its totient is φ = 14718360.

The previous prime is 18397957. The next prime is 18397979. The reversal of 18397975 is 57979381.

It is not a de Polignac number, because 18397975 - 2¹³ = 18389783 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18397979) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 367935 + ... + 367984.

Almost surely, 2^18397975 is an apocalyptic number.

18397975 is a deficient number, since it is larger than the sum of its proper divisors (4415545).

18397975 is an equidigital number, since it uses as much as digits as its factorization.

18397975 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 735929 (or 735924 counting only the distinct ones).

The product of its digits is 476280, while the sum is 49.

The square root of 18397975 is about 4289.2860711312. The cubic root of 18397975 is about 263.9915391764.

The spelling of 18397975 in words is "eighteen million, three hundred ninety-seven thousand, nine hundred seventy-five".