18897227 has 2 divisors, whose sum is σ = 18897228. Its totient is φ = 18897226.

The previous prime is 18897173. The next prime is 18897233. The reversal of 18897227 is 72279881.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18897227 - 2¹⁴ = 18880843 is a prime.

It is not a weakly prime, because it can be changed into another prime (18897247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9448613 + 9448614.

It is an arithmetic number, because the mean of its divisors is an integer number (9448614).

Almost surely, 2^18897227 is an apocalyptic number.

18897227 is a deficient number, since it is larger than the sum of its proper divisors (1).

18897227 is an equidigital number, since it uses as much as digits as its factorization.

18897227 is an evil number, because the sum of its binary digits is even.

The product of its digits is 112896, while the sum is 44.

The square root of 18897227 is about 4347.0940868585. The cubic root of 18897227 is about 266.3581725957.

The spelling of 18897227 in words is "eighteen million, eight hundred ninety-seven thousand, two hundred twenty-seven".