18489227 has 2 divisors, whose sum is σ = 18489228. Its totient is φ = 18489226.

The previous prime is 18489203. The next prime is 18489241. The reversal of 18489227 is 72298481.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18489227 - 2⁸ = 18488971 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18489257) 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 as a sum of consecutive naturals, namely, 9244613 + 9244614.

It is an arithmetic number, because the mean of its divisors is an integer number (9244614).

Almost surely, 2^18489227 is an apocalyptic number.

18489227 is a deficient number, since it is larger than the sum of its proper divisors (1).

18489227 is an equidigital number, since it uses as much as digits as its factorization.

18489227 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 64512, while the sum is 41.

The square root of 18489227 is about 4299.9101153396. The cubic root of 18489227 is about 264.4272762212.

The spelling of 18489227 in words is "eighteen million, four hundred eighty-nine thousand, two hundred twenty-seven".