129979798440 has 32 divisors (see below), whose sum is σ = 389939395680. Its totient is φ = 34661279552.

The previous prime is 129979798427. The next prime is 129979798441. The reversal of 129979798440 is 44897979921.

It is not an unprimeable number, because it can be changed into a prime (129979798441) 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, 541582374 + ... + 541582613.

It is an arithmetic number, because the mean of its divisors is an integer number (12185606115).

Almost surely, 2^129979798440 is an apocalyptic number.

129979798440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

129979798440 is an abundant number, since it is smaller than the sum of its proper divisors (259959597240).

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

129979798440 is a wasteful number, since it uses less digits than its factorization.

129979798440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1083165001 (or 1083164997 counting only the distinct ones).

The product of its (nonzero) digits is 82301184, while the sum is 69.

The spelling of 129979798440 in words is "one hundred twenty-nine billion, nine hundred seventy-nine million, seven hundred ninety-eight thousand, four hundred forty".