18686227 has 4 divisors (see below), whose sum is σ = 21355696. Its totient is φ = 16016760.

The previous prime is 18686203. The next prime is 18686231. The reversal of 18686227 is 72268681.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 18686227 - 2²³ = 10297619 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 18686227.

It is not an unprimeable number, because it can be changed into a prime (18686257) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1334724 + ... + 1334737.

It is an arithmetic number, because the mean of its divisors is an integer number (5338924).

Almost surely, 2^18686227 is an apocalyptic number.

18686227 is a deficient number, since it is larger than the sum of its proper divisors (2669469).

18686227 is an equidigital number, since it uses as much as digits as its factorization.

18686227 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2669468.

The product of its digits is 64512, while the sum is 40.

The square root of 18686227 is about 4322.7568749584. The cubic root of 18686227 is about 265.3631049493.

The spelling of 18686227 in words is "eighteen million, six hundred eighty-six thousand, two hundred twenty-seven".