231023474440 has 128 divisors (see below), whose sum is σ = 578921644800. Its totient is φ = 82257310720.

The previous prime is 231023474399. The next prime is 231023474443. The reversal of 231023474440 is 44474320132.

It is a junction number, because it is equal to n+sod(n) for n = 231023474396 and 231023474405.

It is not an unprimeable number, because it can be changed into a prime (231023474443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11860149 + ... + 11879611.

It is an arithmetic number, because the mean of its divisors is an integer number (4522825350).

Almost surely, 2^231023474440 is an apocalyptic number.

231023474440 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 231023474440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (289460822400).

231023474440 is an abundant number, since it is smaller than the sum of its proper divisors (347898170360).

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

231023474440 is a wasteful number, since it uses less digits than its factorization.

231023474440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20047 (or 20043 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 34.

Adding to 231023474440 its reverse (44474320132), we get a palindrome (275497794572).

The spelling of 231023474440 in words is "two hundred thirty-one billion, twenty-three million, four hundred seventy-four thousand, four hundred forty".