129809292 has 48 divisors (see below), whose sum is σ = 320544000. Its totient is φ = 40772160.

The previous prime is 129809287. The next prime is 129809353. The reversal of 129809292 is 292908921.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 43942 + ... + 46802.

It is an arithmetic number, because the mean of its divisors is an integer number (6678000).

Almost surely, 2^129809292 is an apocalyptic number.

129809292 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 129809292, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (160272000).

129809292 is an abundant number, since it is smaller than the sum of its proper divisors (190734708).

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

129809292 is a wasteful number, since it uses less digits than its factorization.

129809292 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3086 (or 3084 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 42.

The square root of 129809292 is about 11393.3880825679. The cubic root of 129809292 is about 506.3318658036.

The spelling of 129809292 in words is "one hundred twenty-nine million, eight hundred nine thousand, two hundred ninety-two".