129797379840 has 144 divisors (see below), whose sum is σ = 414905885856. Its totient is φ = 34582118400.

The previous prime is 129797379823. The next prime is 129797379857. The reversal of 129797379840 is 48973797921.

It is an interprime number because it is at equal distance from previous prime (129797379823) and next prime (129797379857).

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, 4520730 + ... + 4549350.

It is an arithmetic number, because the mean of its divisors is an integer number (2881290874).

Almost surely, 2^129797379840 is an apocalyptic number.

129797379840 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 129797379840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (207452942928).

129797379840 is an abundant number, since it is smaller than the sum of its proper divisors (285108506016).

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

129797379840 is a wasteful number, since it uses less digits than its factorization.

129797379840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29826 (or 29812 counting only the distinct ones).

The product of its (nonzero) digits is 48009024, while the sum is 66.

The spelling of 129797379840 in words is "one hundred twenty-nine billion, seven hundred ninety-seven million, three hundred seventy-nine thousand, eight hundred forty".