398439497898 has 48 divisors (see below), whose sum is σ = 929738060160. Its totient is φ = 122590716192.

The previous prime is 398439497893. The next prime is 398439497909. The reversal of 398439497898 is 898794934893.

398439497898 is a `hidden beast` number, since 3 + 9 + 8 + 4 + 39 + 497 + 8 + 98 = 666.

It is not an unprimeable number, because it can be changed into a prime (398439497893) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7940115 + ... + 7990137.

It is an arithmetic number, because the mean of its divisors is an integer number (19369542920).

Almost surely, 2^398439497898 is an apocalyptic number.

398439497898 is an abundant number, since it is smaller than the sum of its proper divisors (531298562262).

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

398439497898 is a wasteful number, since it uses less digits than its factorization.

398439497898 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84083 (or 84080 counting only the distinct ones).

The product of its digits is 3386105856, while the sum is 81.

The spelling of 398439497898 in words is "three hundred ninety-eight billion, four hundred thirty-nine million, four hundred ninety-seven thousand, eight hundred ninety-eight".