398236218020 has 24 divisors (see below), whose sum is σ = 865133854200. Its totient is φ = 153801573632.

The previous prime is 398236218019. The next prime is 398236218043. The reversal of 398236218020 is 20812632893.

It can be written as a sum of positive squares in 4 ways, for example, as 14260181056 + 383976036964 = 119416^2 + 619658^2 .

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, 343306505 + ... + 343307664.

It is an arithmetic number, because the mean of its divisors is an integer number (36047243925).

Almost surely, 2^398236218020 is an apocalyptic number.

It is an amenable number.

398236218020 is an abundant number, since it is smaller than the sum of its proper divisors (466897636180).

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

398236218020 is a wasteful number, since it uses less digits than its factorization.

398236218020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 686614207 (or 686614205 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 44.

The spelling of 398236218020 in words is "three hundred ninety-eight billion, two hundred thirty-six million, two hundred eighteen thousand, twenty".