398558999 has 8 divisors (see below), whose sum is σ = 426746880. Its totient is φ = 370898176.

The previous prime is 398558989. The next prime is 398559001. The reversal of 398558999 is 999855893.

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

It is a cyclic number.

It is not a de Polignac number, because 398558999 - 2²⁰ = 397510423 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (398558929) 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, 130199 + ... + 133224.

It is an arithmetic number, because the mean of its divisors is an integer number (53343360).

Almost surely, 2^398558999 is an apocalyptic number.

398558999 is a deficient number, since it is larger than the sum of its proper divisors (28187881).

398558999 is a wasteful number, since it uses less digits than its factorization.

398558999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 263529.

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

The square root of 398558999 is about 19963.9424713657. The cubic root of 398558999 is about 735.9204529409.

The spelling of 398558999 in words is "three hundred ninety-eight million, five hundred fifty-eight thousand, nine hundred ninety-nine".