129256 has 16 divisors (see below), whose sum is σ = 246240. Its totient is φ = 63600.

The previous prime is 129229. The next prime is 129263. The reversal of 129256 is 652921.

It is a super-2 number, since 2×129256² = 33414227072, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a plaindrome in base 13.

It is a self number, because there is not a number n which added to its sum of digits gives 129256.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 781 + ... + 931.

It is an arithmetic number, because the mean of its divisors is an integer number (15390).

2¹²⁹²⁵⁶ is an apocalyptic number.

It is an amenable number.

129256 is a deficient number, since it is larger than the sum of its proper divisors (116984).

129256 is a wasteful number, since it uses less digits than its factorization.

129256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 264 (or 260 counting only the distinct ones).

The product of its digits is 1080, while the sum is 25.

The square root of 129256 is about 359.5219047569. The cubic root of 129256 is about 50.5611454235.

The spelling of 129256 in words is "one hundred twenty-nine thousand, two hundred fifty-six".