398708389 has 2 divisors, whose sum is σ = 398708390. Its totient is φ = 398708388.

The previous prime is 398708281. The next prime is 398708393. The reversal of 398708389 is 983807893.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 397404225 + 1304164 = 19935^2 + 1142^2 .

It is a cyclic number.

It is not a de Polignac number, because 398708389 - 2⁹ = 398707877 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (398708399) 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, 199354194 + 199354195.

It is an arithmetic number, because the mean of its divisors is an integer number (199354195).

Almost surely, 2^398708389 is an apocalyptic number.

It is an amenable number.

398708389 is a deficient number, since it is larger than the sum of its proper divisors (1).

398708389 is an equidigital number, since it uses as much as digits as its factorization.

398708389 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2612736, while the sum is 55.

The square root of 398708389 is about 19967.6836162836. The cubic root of 398708389 is about 736.0123886590.

The spelling of 398708389 in words is "three hundred ninety-eight million, seven hundred eight thousand, three hundred eighty-nine".