18512197 has 8 divisors (see below), whose sum is σ = 20688192. Its totient is φ = 16418400.

The previous prime is 18512161. The next prime is 18512203. The reversal of 18512197 is 79121581.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18512197 - 2⁷ = 18512069 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18512107) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20073 + ... + 20974.

It is an arithmetic number, because the mean of its divisors is an integer number (2586024).

Almost surely, 2^18512197 is an apocalyptic number.

It is an amenable number.

18512197 is a deficient number, since it is larger than the sum of its proper divisors (2175995).

18512197 is a wasteful number, since it uses less digits than its factorization.

18512197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41099.

The product of its digits is 5040, while the sum is 34.

The square root of 18512197 is about 4302.5802723482. The cubic root of 18512197 is about 264.5367342131.

It can be divided in two parts, 18 and 512197, that added together give a palindrome (512215).

The spelling of 18512197 in words is "eighteen million, five hundred twelve thousand, one hundred ninety-seven".