398324891 has 2 divisors, whose sum is σ = 398324892. Its totient is φ = 398324890.

The previous prime is 398324827. The next prime is 398325001. The reversal of 398324891 is 198423893.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 398324891 - 2⁶ = 398324827 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (398324491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199162445 + 199162446.

It is an arithmetic number, because the mean of its divisors is an integer number (199162446).

Almost surely, 2^398324891 is an apocalyptic number.

398324891 is a deficient number, since it is larger than the sum of its proper divisors (1).

398324891 is an equidigital number, since it uses as much as digits as its factorization.

398324891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 373248, while the sum is 47.

The square root of 398324891 is about 19958.0783393592. The cubic root of 398324891 is about 735.7763349146.

The spelling of 398324891 in words is "three hundred ninety-eight million, three hundred twenty-four thousand, eight hundred ninety-one".