129391012 has 24 divisors (see below), whose sum is σ = 243825120. Its totient is φ = 59856000.

The previous prime is 129391001. The next prime is 129391027. The reversal of 129391012 is 210193921.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12114 + ... + 20137.

It is an arithmetic number, because the mean of its divisors is an integer number (10159380).

Almost surely, 2^129391012 is an apocalyptic number.

It is an amenable number.

129391012 is a deficient number, since it is larger than the sum of its proper divisors (114434108).

129391012 is a wasteful number, since it uses less digits than its factorization.

129391012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32331 (or 32329 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 28.

The square root of 129391012 is about 11375.0170109763. The cubic root of 129391012 is about 505.7874353876.

The spelling of 129391012 in words is "one hundred twenty-nine million, three hundred ninety-one thousand, twelve".