18355197 has 32 divisors (see below), whose sum is σ = 29721600. Its totient is φ = 9842688.

The previous prime is 18355171. The next prime is 18355199. The reversal of 18355197 is 79155381.

It is not a de Polignac number, because 18355197 - 2¹⁰ = 18354173 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18355199) 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 31 ways as a sum of consecutive naturals, for example, 71293 + ... + 71549.

It is an arithmetic number, because the mean of its divisors is an integer number (928800).

Almost surely, 2^18355197 is an apocalyptic number.

It is an amenable number.

18355197 is a deficient number, since it is larger than the sum of its proper divisors (11366403).

18355197 is a wasteful number, since it uses less digits than its factorization.

18355197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 465.

The product of its digits is 37800, while the sum is 39.

The square root of 18355197 is about 4284.2965583629. The cubic root of 18355197 is about 263.7867739954.

The spelling of 18355197 in words is "eighteen million, three hundred fifty-five thousand, one hundred ninety-seven".