398649959 has 2 divisors, whose sum is σ = 398649960. Its totient is φ = 398649958.

The previous prime is 398649917. The next prime is 398649967. The reversal of 398649959 is 959946893.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 398649959 - 2⁸ = 398649703 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (398649989) 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, 199324979 + 199324980.

It is an arithmetic number, because the mean of its divisors is an integer number (199324980).

Almost surely, 2^398649959 is an apocalyptic number.

398649959 is a deficient number, since it is larger than the sum of its proper divisors (1).

398649959 is an equidigital number, since it uses as much as digits as its factorization.

398649959 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18895680, while the sum is 62.

The square root of 398649959 is about 19966.2204485476. The cubic root of 398649959 is about 735.9764331370.

The spelling of 398649959 in words is "three hundred ninety-eight million, six hundred forty-nine thousand, nine hundred fifty-nine".