398903591 has 2 divisors, whose sum is σ = 398903592. Its totient is φ = 398903590.

The previous prime is 398903569. The next prime is 398903633. The reversal of 398903591 is 195309893.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-398903591 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (398903501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199451795 + 199451796.

It is an arithmetic number, because the mean of its divisors is an integer number (199451796).

Almost surely, 2^398903591 is an apocalyptic number.

398903591 is a deficient number, since it is larger than the sum of its proper divisors (1).

398903591 is an equidigital number, since it uses as much as digits as its factorization.

398903591 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 262440, while the sum is 47.

The square root of 398903591 is about 19972.5709662026. The cubic root of 398903591 is about 736.1324828216.

The spelling of 398903591 in words is "three hundred ninety-eight million, nine hundred three thousand, five hundred ninety-one".