129394199772 has 144 divisors (see below), whose sum is σ = 355400136000. Its totient is φ = 39533445120.

The previous prime is 129394199719. The next prime is 129394199821. The reversal of 129394199772 is 277991493921.

129394199772 is a `hidden beast` number, since 1 + 293 + 94 + 199 + 7 + 72 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 15025804 + ... + 15034412.

It is an arithmetic number, because the mean of its divisors is an integer number (2468056500).

Almost surely, 2^129394199772 is an apocalyptic number.

129394199772 is a gapful number since it is divisible by the number (12) 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 129394199772, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (177700068000).

129394199772 is an abundant number, since it is smaller than the sum of its proper divisors (226005936228).

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

129394199772 is a wasteful number, since it uses less digits than its factorization.

129394199772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9276 (or 9271 counting only the distinct ones).

The product of its digits is 15431472, while the sum is 63.

The spelling of 129394199772 in words is "one hundred twenty-nine billion, three hundred ninety-four million, one hundred ninety-nine thousand, seven hundred seventy-two".