398305889 has 2 divisors, whose sum is σ = 398305890. Its totient is φ = 398305888.

The previous prime is 398305849. The next prime is 398305933. The reversal of 398305889 is 988503893.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 335182864 + 63123025 = 18308^2 + 7945^2 .

It is a cyclic number.

It is not a de Polignac number, because 398305889 - 2¹² = 398301793 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 398305889.

It is not a weakly prime, because it can be changed into another prime (398305819) 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, 199152944 + 199152945.

It is an arithmetic number, because the mean of its divisors is an integer number (199152945).

Almost surely, 2^398305889 is an apocalyptic number.

It is an amenable number.

398305889 is a deficient number, since it is larger than the sum of its proper divisors (1).

398305889 is an equidigital number, since it uses as much as digits as its factorization.

398305889 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1866240, while the sum is 53.

The square root of 398305889 is about 19957.6022858459. The cubic root of 398305889 is about 735.7646347132.

The spelling of 398305889 in words is "three hundred ninety-eight million, three hundred five thousand, eight hundred eighty-nine".