398559989 has 8 divisors (see below), whose sum is σ = 402879960. Its totient is φ = 394260736.

The previous prime is 398559949. The next prime is 398560037. The reversal of 398559989 is 989955893.

It can be written as a sum of positive squares in 4 ways, for example, as 110986225 + 287573764 = 10535^2 + 16958^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-398559989 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (398559919) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35177 + ... + 45105.

It is an arithmetic number, because the mean of its divisors is an integer number (50359995).

Almost surely, 2^398559989 is an apocalyptic number.

It is an amenable number.

398559989 is a deficient number, since it is larger than the sum of its proper divisors (4319971).

398559989 is a wasteful number, since it uses less digits than its factorization.

398559989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10359.

The product of its digits is 31492800, while the sum is 65.

The square root of 398559989 is about 19963.9672660521. The cubic root of 398559989 is about 735.9210622699.

The spelling of 398559989 in words is "three hundred ninety-eight million, five hundred fifty-nine thousand, nine hundred eighty-nine".