231858439140 has 24 divisors (see below), whose sum is σ = 649203629760. Its totient is φ = 61828917088.

The previous prime is 231858439133. The next prime is 231858439147. The reversal of 231858439140 is 41934858132.

It is an interprime number because it is at equal distance from previous prime (231858439133) and next prime (231858439147).

It is a self number, because there is not a number n which added to its sum of digits gives 231858439140.

It is not an unprimeable number, because it can be changed into a prime (231858439147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1932153600 + ... + 1932153719.

It is an arithmetic number, because the mean of its divisors is an integer number (27050151240).

Almost surely, 2^231858439140 is an apocalyptic number.

231858439140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231858439140 is an abundant number, since it is smaller than the sum of its proper divisors (417345190620).

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

231858439140 is a wasteful number, since it uses less digits than its factorization.

231858439140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3864307331 (or 3864307329 counting only the distinct ones).

The product of its (nonzero) digits is 829440, while the sum is 48.

The spelling of 231858439140 in words is "two hundred thirty-one billion, eight hundred fifty-eight million, four hundred thirty-nine thousand, one hundred forty".