18705227 has 2 divisors, whose sum is σ = 18705228. Its totient is φ = 18705226.

The previous prime is 18705217. The next prime is 18705257. The reversal of 18705227 is 72250781.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18705227 - 2²⁴ = 1928011 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 18705193 and 18705202.

It is not a weakly prime, because it can be changed into another prime (18705217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9352613 + 9352614.

It is an arithmetic number, because the mean of its divisors is an integer number (9352614).

Almost surely, 2^18705227 is an apocalyptic number.

18705227 is a deficient number, since it is larger than the sum of its proper divisors (1).

18705227 is an equidigital number, since it uses as much as digits as its factorization.

18705227 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7840, while the sum is 32.

The square root of 18705227 is about 4324.9539881946. The cubic root of 18705227 is about 265.4530141483.

The spelling of 18705227 in words is "eighteen million, seven hundred five thousand, two hundred twenty-seven".