398558998 has 4 divisors (see below), whose sum is σ = 597838500. Its totient is φ = 199279498.

The previous prime is 398558989. The next prime is 398559001. The reversal of 398558998 is 899855893.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99639748 + ... + 99639751.

It is an arithmetic number, because the mean of its divisors is an integer number (149459625).

Almost surely, 2^398558998 is an apocalyptic number.

398558998 is a deficient number, since it is larger than the sum of its proper divisors (199279502).

398558998 is a wasteful number, since it uses less digits than its factorization.

398558998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199279501.

The product of its digits is 27993600, while the sum is 64.

The square root of 398558998 is about 19963.9424463206. The cubic root of 398558998 is about 735.9204523254.

The spelling of 398558998 in words is "three hundred ninety-eight million, five hundred fifty-eight thousand, nine hundred ninety-eight".