18663227 has 4 divisors (see below), whose sum is σ = 20359896. Its totient is φ = 16966560.

The previous prime is 18663217. The next prime is 18663233. The reversal of 18663227 is 72236681.

It is a happy number.

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 18663227 - 2⁶ = 18663163 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18663217) 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, 848318 + ... + 848339.

It is an arithmetic number, because the mean of its divisors is an integer number (5089974).

Almost surely, 2^18663227 is an apocalyptic number.

18663227 is a deficient number, since it is larger than the sum of its proper divisors (1696669).

18663227 is a wasteful number, since it uses less digits than its factorization.

18663227 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1696668.

The product of its digits is 24192, while the sum is 35.

The square root of 18663227 is about 4320.0957165322. The cubic root of 18663227 is about 265.2541859179.

The spelling of 18663227 in words is "eighteen million, six hundred sixty-three thousand, two hundred twenty-seven".