129031868 has 12 divisors (see below), whose sum is σ = 258063792. Its totient is φ = 55299360.

The previous prime is 129031867. The next prime is 129031871. The reversal of 129031868 is 868130921.

129031868 is an admirable number.

It is a hoax number, since the sum of its digits (38) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129031867) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 2304113 + ... + 2304168.

It is an arithmetic number, because the mean of its divisors is an integer number (21505316).

Almost surely, 2^129031868 is an apocalyptic number.

It is an amenable number.

129031868 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

129031868 is a wasteful number, since it uses less digits than its factorization.

129031868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4608292 (or 4608290 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 38.

The square root of 129031868 is about 11359.2195154421. The cubic root of 129031868 is about 505.3190389987.

The spelling of 129031868 in words is "one hundred twenty-nine million, thirty-one thousand, eight hundred sixty-eight".