129825836 has 24 divisors (see below), whose sum is σ = 261112320. Its totient is φ = 55326672.

The previous prime is 129825811. The next prime is 129825851. The reversal of 129825836 is 638528921.

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 7 ways as a sum of consecutive naturals, for example, 7940 + ... + 17963.

It is an arithmetic number, because the mean of its divisors is an integer number (10879680).

Almost surely, 2^129825836 is an apocalyptic number.

It is an amenable number.

129825836 is an abundant number, since it is smaller than the sum of its proper divisors (131286484).

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

129825836 is a wasteful number, since it uses less digits than its factorization.

129825836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26093 (or 26091 counting only the distinct ones).

The product of its digits is 207360, while the sum is 44.

The square root of 129825836 is about 11394.1140945665. The cubic root of 129825836 is about 506.3533753027.

The spelling of 129825836 in words is "one hundred twenty-nine million, eight hundred twenty-five thousand, eight hundred thirty-six".