398166227 has 2 divisors, whose sum is σ = 398166228. Its totient is φ = 398166226.

The previous prime is 398166217. The next prime is 398166229. The reversal of 398166227 is 722661893.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 398166227 - 2²⁸ = 129730771 is a prime.

Together with 398166229, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (398166229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199083113 + 199083114.

It is an arithmetic number, because the mean of its divisors is an integer number (199083114).

Almost surely, 2^398166227 is an apocalyptic number.

398166227 is a deficient number, since it is larger than the sum of its proper divisors (1).

398166227 is an equidigital number, since it uses as much as digits as its factorization.

398166227 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 217728, while the sum is 44.

The square root of 398166227 is about 19954.1030116615. The cubic root of 398166227 is about 735.6786284753.

The spelling of 398166227 in words is "three hundred ninety-eight million, one hundred sixty-six thousand, two hundred twenty-seven".