129109120 has 192 divisors, whose sum is σ = 376747200. Its totient is φ = 42104832.

The previous prime is 129109117. The next prime is 129109121. The reversal of 129109120 is 21901921.

It is not an unprimeable number, because it can be changed into a prime (129109121) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 721191 + ... + 721369.

It is an arithmetic number, because the mean of its divisors is an integer number (1962225).

Almost surely, 2^129109120 is an apocalyptic number.

129109120 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 129109120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (188373600).

129109120 is an abundant number, since it is smaller than the sum of its proper divisors (247638080).

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

129109120 is a wasteful number, since it uses less digits than its factorization.

129109120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 235 (or 216 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 25.

The square root of 129109120 is about 11362.6194163142. The cubic root of 129109120 is about 505.4198645262.

The spelling of 129109120 in words is "one hundred twenty-nine million, one hundred nine thousand, one hundred twenty".