129956 has 12 divisors (see below), whose sum is σ = 232092. Its totient is φ = 63648.

The previous prime is 129953. The next prime is 129959. The reversal of 129956 is 659921.

It is an interprime number because it is at equal distance from previous prime (129953) and next prime (129959).

It can be written as a sum of positive squares in 2 ways, for example, as 33856 + 96100 = 184^2 + 310^2 .

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (129953) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 95 + ... + 518.

It is an arithmetic number, because the mean of its divisors is an integer number (19341).

2¹²⁹⁹⁵⁶ is an apocalyptic number.

It is an amenable number.

129956 is a deficient number, since it is larger than the sum of its proper divisors (102136).

129956 is a wasteful number, since it uses less digits than its factorization.

129956 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 670 (or 668 counting only the distinct ones).

The product of its digits is 4860, while the sum is 32.

The square root of 129956 is about 360.4941053610. The cubic root of 129956 is about 50.6522542879.

The spelling of 129956 in words is "one hundred twenty-nine thousand, nine hundred fifty-six".