129071292 has 72 divisors (see below), whose sum is σ = 352243584. Its totient is φ = 36677088.

The previous prime is 129071269. The next prime is 129071329. The reversal of 129071292 is 292170921.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 132993 + ... + 133959.

It is an arithmetic number, because the mean of its divisors is an integer number (4892272).

Almost surely, 2^129071292 is an apocalyptic number.

129071292 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 129071292, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (176121792).

129071292 is an abundant number, since it is smaller than the sum of its proper divisors (223172292).

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

129071292 is a wasteful number, since it uses less digits than its factorization.

129071292 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1215 (or 1206 counting only the distinct ones).

The product of its (nonzero) digits is 4536, while the sum is 33.

The square root of 129071292 is about 11360.9547134033. The cubic root of 129071292 is about 505.3704982997.

The spelling of 129071292 in words is "one hundred twenty-nine million, seventy-one thousand, two hundred ninety-two".