18506227 has 2 divisors, whose sum is σ = 18506228. Its totient is φ = 18506226.

The previous prime is 18506197. The next prime is 18506231. The reversal of 18506227 is 72260581.

It is a strong prime.

It is an emirp because it is prime and its reverse (72260581) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18506227 - 2²³ = 10117619 is a prime.

It is not a weakly prime, because it can be changed into another prime (18506027) 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, 9253113 + 9253114.

It is an arithmetic number, because the mean of its divisors is an integer number (9253114).

Almost surely, 2^18506227 is an apocalyptic number.

18506227 is a deficient number, since it is larger than the sum of its proper divisors (1).

18506227 is an equidigital number, since it uses as much as digits as its factorization.

18506227 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6720, while the sum is 31.

The square root of 18506227 is about 4301.8864466650. The cubic root of 18506227 is about 264.5082943310.

The spelling of 18506227 in words is "eighteen million, five hundred six thousand, two hundred twenty-seven".