129972822 has 64 divisors (see below), whose sum is σ = 305647104. Its totient is φ = 36080640.

The previous prime is 129972763. The next prime is 129972833. The reversal of 129972822 is 228279921.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 248253 + ... + 248775.

It is an arithmetic number, because the mean of its divisors is an integer number (4775736).

Almost surely, 2^129972822 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 129972822, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (152823552).

129972822 is an abundant number, since it is smaller than the sum of its proper divisors (175674282).

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

129972822 is a wasteful number, since it uses less digits than its factorization.

129972822 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 693.

The product of its digits is 72576, while the sum is 42.

The square root of 129972822 is about 11400.5623545508. The cubic root of 129972822 is about 506.5443973391.

The spelling of 129972822 in words is "one hundred twenty-nine million, nine hundred seventy-two thousand, eight hundred twenty-two".