18397597 has 4 divisors (see below), whose sum is σ = 18672256. Its totient is φ = 18122940.

The previous prime is 18397583. The next prime is 18397607. The reversal of 18397597 is 79579381.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18397597 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18397597.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18397517) 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 3 ways as a sum of consecutive naturals, for example, 137229 + ... + 137362.

It is an arithmetic number, because the mean of its divisors is an integer number (4668064).

Almost surely, 2^18397597 is an apocalyptic number.

It is an amenable number.

18397597 is a deficient number, since it is larger than the sum of its proper divisors (274659).

18397597 is an equidigital number, since it uses as much as digits as its factorization.

18397597 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 274658.

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

The square root of 18397597 is about 4289.2420076279. The cubic root of 18397597 is about 263.9897311968.

The spelling of 18397597 in words is "eighteen million, three hundred ninety-seven thousand, five hundred ninety-seven".