12399755720 has 160 divisors (see below), whose sum is σ = 31725561600. Its totient is φ = 4357161600.

The previous prime is 12399755677. The next prime is 12399755741. The reversal of 12399755720 is 2755799321.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 18154499 + ... + 18155181.

It is an arithmetic number, because the mean of its divisors is an integer number (198284760).

Almost surely, 2^12399755720 is an apocalyptic number.

12399755720 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 12399755720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15862780800).

12399755720 is an abundant number, since it is smaller than the sum of its proper divisors (19325805880).

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

12399755720 is an equidigital number, since it uses as much as digits as its factorization.

12399755720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 769 (or 732 counting only the distinct ones).

The product of its (nonzero) digits is 1190700, while the sum is 50.

The spelling of 12399755720 in words is "twelve billion, three hundred ninety-nine million, seven hundred fifty-five thousand, seven hundred twenty".