129556 has 18 divisors (see below), whose sum is σ = 264138. Its totient is φ = 55440.

The previous prime is 129553. The next prime is 129581. The reversal of 129556 is 655921.

It can be written as a sum of positive squares in only one way, i.e., 122500 + 7056 = 350^2 + 84^2 .

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129553) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 135 + ... + 526.

2¹²⁹⁵⁵⁶ is an apocalyptic number.

It is an amenable number.

129556 is an abundant number, since it is smaller than the sum of its proper divisors (134582).

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

129556 is a wasteful number, since it uses less digits than its factorization.

129556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 679 (or 670 counting only the distinct ones).

The product of its digits is 2700, while the sum is 28.

The square root of 129556 is about 359.9388837011. The cubic root of 129556 is about 50.6002322579.

The spelling of 129556 in words is "one hundred twenty-nine thousand, five hundred fifty-six".