398452891 has 2 divisors, whose sum is σ = 398452892. Its totient is φ = 398452890.

The previous prime is 398452877. The next prime is 398452937. The reversal of 398452891 is 198254893.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 398452891 - 2¹³ = 398444699 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (398455891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199226445 + 199226446.

It is an arithmetic number, because the mean of its divisors is an integer number (199226446).

Almost surely, 2^398452891 is an apocalyptic number.

398452891 is a deficient number, since it is larger than the sum of its proper divisors (1).

398452891 is an equidigital number, since it uses as much as digits as its factorization.

398452891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 622080, while the sum is 49.

The square root of 398452891 is about 19961.2848033387. The cubic root of 398452891 is about 735.8551393334.

The spelling of 398452891 in words is "three hundred ninety-eight million, four hundred fifty-two thousand, eight hundred ninety-one".