129256752 has 20 divisors (see below), whose sum is σ = 333913400. Its totient is φ = 43085568.

The previous prime is 129256739. The next prime is 129256759. The reversal of 129256752 is 257652921.

It is a self number, because there is not a number n which added to its sum of digits gives 129256752.

It is not an unprimeable number, because it can be changed into a prime (129256759) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 1346377 + ... + 1346472.

It is an arithmetic number, because the mean of its divisors is an integer number (16695670).

Almost surely, 2^129256752 is an apocalyptic number.

129256752 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

129256752 is an abundant number, since it is smaller than the sum of its proper divisors (204656648).

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

129256752 is a wasteful number, since it uses less digits than its factorization.

129256752 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2692860 (or 2692854 counting only the distinct ones).

The product of its digits is 75600, while the sum is 39.

The square root of 129256752 is about 11369.1139496444. The cubic root of 129256752 is about 505.6124347673.

The spelling of 129256752 in words is "one hundred twenty-nine million, two hundred fifty-six thousand, seven hundred fifty-two".