129689 has 8 divisors (see below), whose sum is σ = 150528. Its totient is φ = 109440.

The previous prime is 129671. The next prime is 129707. The reversal of 129689 is 986921.

It is an interprime number because it is at equal distance from previous prime (129671) and next prime (129707).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 129689 - 2¹⁶ = 64153 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (129629) 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 7 ways as a sum of consecutive naturals, for example, 584 + ... + 774.

It is an arithmetic number, because the mean of its divisors is an integer number (18816).

2¹²⁹⁶⁸⁹ is an apocalyptic number.

It is an amenable number.

129689 is a deficient number, since it is larger than the sum of its proper divisors (20839).

129689 is an equidigital number, since it uses as much as digits as its factorization.

129689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 295.

The product of its digits is 7776, while the sum is 35.

The square root of 129689 is about 360.1235898966. The cubic root of 129689 is about 50.6175414506.

It can be divided in two parts, 129 and 689, that added together give a palindrome (818).

The spelling of 129689 in words is "one hundred twenty-nine thousand, six hundred eighty-nine".