129944256 has 112 divisors (see below), whose sum is σ = 375513600. Its totient is φ = 39416832.

The previous prime is 129944251. The next prime is 129944263. The reversal of 129944256 is 652449921.

It is not an unprimeable number, because it can be changed into a prime (129944251) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 196855 + ... + 197513.

It is an arithmetic number, because the mean of its divisors is an integer number (3352800).

Almost surely, 2^129944256 is an apocalyptic number.

129944256 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 129944256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (187756800).

129944256 is an abundant number, since it is smaller than the sum of its proper divisors (245569344).

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

129944256 is a wasteful number, since it uses less digits than its factorization.

129944256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 766 (or 756 counting only the distinct ones).

The product of its digits is 155520, while the sum is 42.

The square root of 129944256 is about 11399.3094527695. The cubic root of 129944256 is about 506.5072844328.

The spelling of 129944256 in words is "one hundred twenty-nine million, nine hundred forty-four thousand, two hundred fifty-six".