129042872 has 24 divisors (see below), whose sum is σ = 281459160. Its totient is φ = 55303920.

The previous prime is 129042833. The next prime is 129042887. The reversal of 129042872 is 278240921.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 164204 + ... + 164987.

It is an arithmetic number, because the mean of its divisors is an integer number (11727465).

Almost surely, 2^129042872 is an apocalyptic number.

It is an amenable number.

129042872 is an abundant number, since it is smaller than the sum of its proper divisors (152416288).

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

129042872 is a wasteful number, since it uses less digits than its factorization.

129042872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 329211 (or 329200 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 129042872 is about 11359.7038693797. The cubic root of 129042872 is about 505.3334033381. Note that the first 3 decimals are identical.

The spelling of 129042872 in words is "one hundred twenty-nine million, forty-two thousand, eight hundred seventy-two".