13239105856 has 56 divisors (see below), whose sum is σ = 26742030336. Its totient is φ = 6502003200.

The previous prime is 13239105773. The next prime is 13239105857. The reversal of 13239105856 is 65850193231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13239105857) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 812865 + ... + 828991.

It is an arithmetic number, because the mean of its divisors is an integer number (477536256).

Almost surely, 2^13239105856 is an apocalyptic number.

13239105856 is a gapful number since it is divisible by the number (16) 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 13239105856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13371015168).

13239105856 is an abundant number, since it is smaller than the sum of its proper divisors (13502924480).

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

13239105856 is a wasteful number, since it uses less digits than its factorization.

13239105856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16367 (or 16357 counting only the distinct ones).

The product of its (nonzero) digits is 194400, while the sum is 43.

The spelling of 13239105856 in words is "thirteen billion, two hundred thirty-nine million, one hundred five thousand, eight hundred fifty-six".