18572227 has 2 divisors, whose sum is σ = 18572228. Its totient is φ = 18572226.

The previous prime is 18572219. The next prime is 18572231. The reversal of 18572227 is 72227581.

It is a strong prime.

It is an emirp because it is prime and its reverse (72227581) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18572227 - 2³ = 18572219 is a prime.

It is equal to p_1185469 and since 18572227 and 1185469 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 18572192 and 18572201.

It is not a weakly prime, because it can be changed into another prime (18572287) 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, 9286113 + 9286114.

It is an arithmetic number, because the mean of its divisors is an integer number (9286114).

Almost surely, 2^18572227 is an apocalyptic number.

18572227 is a deficient number, since it is larger than the sum of its proper divisors (1).

18572227 is an equidigital number, since it uses as much as digits as its factorization.

18572227 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15680, while the sum is 34.

The square root of 18572227 is about 4309.5506726340. The cubic root of 18572227 is about 264.8223658253.

The spelling of 18572227 in words is "eighteen million, five hundred seventy-two thousand, two hundred twenty-seven".