129029292 has 36 divisors (see below), whose sum is σ = 372752016. Its totient is φ = 36865440.

The previous prime is 129029281. The next prime is 129029293. The reversal of 129029292 is 292920921.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (129029293) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 255759 + ... + 256262.

Almost surely, 2^129029292 is an apocalyptic number.

129029292 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

129029292 is an abundant number, since it is smaller than the sum of its proper divisors (243722724).

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

129029292 is a wasteful number, since it uses less digits than its factorization.

129029292 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 512038 (or 512033 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 36.

The square root of 129029292 is about 11359.1061268042. The cubic root of 129029292 is about 505.3156762364.

The spelling of 129029292 in words is "one hundred twenty-nine million, twenty-nine thousand, two hundred ninety-two".