398045591 has 2 divisors, whose sum is σ = 398045592. Its totient is φ = 398045590.

The previous prime is 398045579. The next prime is 398045597. The reversal of 398045591 is 195540893.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 398045591 - 2¹⁴ = 398029207 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (398045597) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199022795 + 199022796.

It is an arithmetic number, because the mean of its divisors is an integer number (199022796).

Almost surely, 2^398045591 is an apocalyptic number.

398045591 is a deficient number, since it is larger than the sum of its proper divisors (1).

398045591 is an equidigital number, since it uses as much as digits as its factorization.

398045591 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 194400, while the sum is 44.

The square root of 398045591 is about 19951.0799457072. The cubic root of 398045591 is about 735.6043225820.

The spelling of 398045591 in words is "three hundred ninety-eight million, forty-five thousand, five hundred ninety-one".