398389998 has 16 divisors (see below), whose sum is σ = 799618896. Its totient is φ = 132323520.

The previous prime is 398389939. The next prime is 398390011. The reversal of 398389998 is 899983893.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 116461 + ... + 119832.

It is an arithmetic number, because the mean of its divisors is an integer number (49976181).

Almost surely, 2^398389998 is an apocalyptic number.

398389998 is an abundant number, since it is smaller than the sum of its proper divisors (401228898).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

398389998 is a wasteful number, since it uses less digits than its factorization.

398389998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 236579.

The product of its digits is 30233088, while the sum is 66.

The square root of 398389998 is about 19959.7093666215. The cubic root of 398389998 is about 735.8164207684.

The spelling of 398389998 in words is "three hundred ninety-eight million, three hundred eighty-nine thousand, nine hundred ninety-eight".