398580989 has 2 divisors, whose sum is σ = 398580990. Its totient is φ = 398580988.

The previous prime is 398580979. The next prime is 398581003. The reversal of 398580989 is 989085893.

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., 304781764 + 93799225 = 17458^2 + 9685^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-398580989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (398580979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199290494 + 199290495.

It is an arithmetic number, because the mean of its divisors is an integer number (199290495).

Almost surely, 2^398580989 is an apocalyptic number.

It is an amenable number.

398580989 is a deficient number, since it is larger than the sum of its proper divisors (1).

398580989 is an equidigital number, since it uses as much as digits as its factorization.

398580989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5598720, while the sum is 59.

The square root of 398580989 is about 19964.4932066907. The cubic root of 398580989 is about 735.9339871924.

The spelling of 398580989 in words is "three hundred ninety-eight million, five hundred eighty thousand, nine hundred eighty-nine".