129154256 has 80 divisors (see below), whose sum is σ = 316170240. Its totient is φ = 49645440.

The previous prime is 129154247. The next prime is 129154279. The reversal of 129154256 is 652451921.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 96665 + ... + 97991.

It is an arithmetic number, because the mean of its divisors is an integer number (3952128).

Almost surely, 2^129154256 is an apocalyptic number.

129154256 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 129154256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (158085120).

129154256 is an abundant number, since it is smaller than the sum of its proper divisors (187015984).

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

129154256 is a wasteful number, since it uses less digits than its factorization.

129154256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1432 (or 1426 counting only the distinct ones).

The product of its digits is 21600, while the sum is 35.

The square root of 129154256 is about 11364.6054045004. The cubic root of 129154256 is about 505.4787552101.

It can be divided in two parts, 12915 and 4256, that added together give a palindrome (17171).

The spelling of 129154256 in words is "one hundred twenty-nine million, one hundred fifty-four thousand, two hundred fifty-six".