231312444440 has 128 divisors (see below), whose sum is σ = 649034726400. Its totient is φ = 72079802880.

The previous prime is 231312444431. The next prime is 231312444487. The reversal of 231312444440 is 44444213132.

It is a junction number, because it is equal to n+sod(n) for n = 231312444397 and 231312444406.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 19080701 + ... + 19092819.

It is an arithmetic number, because the mean of its divisors is an integer number (5070583800).

Almost surely, 2^231312444440 is an apocalyptic number.

231312444440 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 231312444440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (324517363200).

231312444440 is an abundant number, since it is smaller than the sum of its proper divisors (417722281960).

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

231312444440 is a wasteful number, since it uses less digits than its factorization.

231312444440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18345 (or 18341 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 32.

Adding to 231312444440 its reverse (44444213132), we get a palindrome (275756657572).

The spelling of 231312444440 in words is "two hundred thirty-one billion, three hundred twelve million, four hundred forty-four thousand, four hundred forty".