231978398340 has 384 divisors, whose sum is σ = 741320294400. Its totient is φ = 53805588480.

The previous prime is 231978398297. The next prime is 231978398357. The reversal of 231978398340 is 43893879132.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 161207341 + ... + 161208779.

It is an arithmetic number, because the mean of its divisors is an integer number (1930521600).

Almost surely, 2^231978398340 is an apocalyptic number.

231978398340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 231978398340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (370660147200).

231978398340 is an abundant number, since it is smaller than the sum of its proper divisors (509341896060).

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

231978398340 is a wasteful number, since it uses less digits than its factorization.

231978398340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1667 (or 1665 counting only the distinct ones).

The product of its (nonzero) digits is 7838208, while the sum is 57.

The spelling of 231978398340 in words is "two hundred thirty-one billion, nine hundred seventy-eight million, three hundred ninety-eight thousand, three hundred forty".