13112323440 has 160 divisors (see below), whose sum is σ = 42371811840. Its totient is φ = 3351186432.

The previous prime is 13112323417. The next prime is 13112323451. The reversal of 13112323440 is 4432321131.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 13112323440.

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, 583941 + ... + 605979.

It is an arithmetic number, because the mean of its divisors is an integer number (264823824).

Almost surely, 2^13112323440 is an apocalyptic number.

13112323440 is a gapful number since it is divisible by the number (10) 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 13112323440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21185905920).

13112323440 is an abundant number, since it is smaller than the sum of its proper divisors (29259488400).

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

13112323440 is a wasteful number, since it uses less digits than its factorization.

13112323440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22159 (or 22153 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 24.

Adding to 13112323440 its reverse (4432321131), we get a palindrome (17544644571).

The spelling of 13112323440 in words is "thirteen billion, one hundred twelve million, three hundred twenty-three thousand, four hundred forty".