398896489 has 2 divisors, whose sum is σ = 398896490. Its totient is φ = 398896488.

The previous prime is 398896481. The next prime is 398896523. The reversal of 398896489 is 984698893.

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., 271590400 + 127306089 = 16480^2 + 11283^2 .

It is an emirp because it is prime and its reverse (984698893) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 398896489 - 2³ = 398896481 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 398896489.

It is not a weakly prime, because it can be changed into another prime (398896481) 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, 199448244 + 199448245.

It is an arithmetic number, because the mean of its divisors is an integer number (199448245).

Almost surely, 2^398896489 is an apocalyptic number.

It is an amenable number.

398896489 is a deficient number, since it is larger than the sum of its proper divisors (1).

398896489 is an equidigital number, since it uses as much as digits as its factorization.

398896489 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 26873856, while the sum is 64.

The square root of 398896489 is about 19972.3931715756. The cubic root of 398896489 is about 736.1281141437.

The spelling of 398896489 in words is "three hundred ninety-eight million, eight hundred ninety-six thousand, four hundred eighty-nine".