231318420440 has 64 divisors (see below), whose sum is σ = 532769650560. Its totient is φ = 90349240320.

The previous prime is 231318420427. The next prime is 231318420451. The reversal of 231318420440 is 44024813132.

231318420440 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 231318420397 and 231318420406.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 671960 + ... + 956120.

It is an arithmetic number, because the mean of its divisors is an integer number (8324525790).

Almost surely, 2^231318420440 is an apocalyptic number.

231318420440 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 231318420440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (266384825280).

231318420440 is an abundant number, since it is smaller than the sum of its proper divisors (301451230120).

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

231318420440 is a wasteful number, since it uses less digits than its factorization.

231318420440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 284652 (or 284648 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 32.

The spelling of 231318420440 in words is "two hundred thirty-one billion, three hundred eighteen million, four hundred twenty thousand, four hundred forty".