18944227 has 2 divisors, whose sum is σ = 18944228. Its totient is φ = 18944226.

The previous prime is 18944207. The next prime is 18944231. The reversal of 18944227 is 72244981.

It is a strong prime.

It is an emirp because it is prime and its reverse (72244981) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18944227 is a prime.

It is not a weakly prime, because it can be changed into another prime (18944207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9472113 + 9472114.

It is an arithmetic number, because the mean of its divisors is an integer number (9472114).

Almost surely, 2^18944227 is an apocalyptic number.

18944227 is a deficient number, since it is larger than the sum of its proper divisors (1).

18944227 is an equidigital number, since it uses as much as digits as its factorization.

18944227 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 32256, while the sum is 37.

The square root of 18944227 is about 4352.4966398609. The cubic root of 18944227 is about 266.5788128999.

The spelling of 18944227 in words is "eighteen million, nine hundred forty-four thousand, two hundred twenty-seven".