129656 has 16 divisors (see below), whose sum is σ = 256200. Its totient is φ = 61344.

The previous prime is 129643. The next prime is 129671. The reversal of 129656 is 656921.

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

It is a congruent number.

It is an unprimeable number.

129656 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

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, 275 + ... + 578.

2¹²⁹⁶⁵⁶ is an apocalyptic number.

It is an amenable number.

129656 is a deficient number, since it is larger than the sum of its proper divisors (126544).

129656 is a wasteful number, since it uses less digits than its factorization.

129656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 878 (or 874 counting only the distinct ones).

The product of its digits is 3240, while the sum is 29.

The square root of 129656 is about 360.0777693777. The cubic root of 129656 is about 50.6132477928.

The spelling of 129656 in words is "one hundred twenty-nine thousand, six hundred fifty-six".