129685 has 8 divisors (see below), whose sum is σ = 160056. Its totient is φ = 100800.

The previous prime is 129671. The next prime is 129707. The reversal of 129685 is 586921.

It can be written as a sum of positive squares in 4 ways, for example, as 60516 + 69169 = 246^2 + 263^2 .

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

It is not a de Polignac number, because 129685 - 2¹¹ = 127637 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable 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 7 ways as a sum of consecutive naturals, for example, 166 + ... + 535.

It is an arithmetic number, because the mean of its divisors is an integer number (20007).

2¹²⁹⁶⁸⁵ is an apocalyptic number.

It is an amenable number.

129685 is a deficient number, since it is larger than the sum of its proper divisors (30371).

129685 is an equidigital number, since it uses as much as digits as its factorization.

129685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 743.

The product of its digits is 4320, while the sum is 31.

The square root of 129685 is about 360.1180362048. The cubic root of 129685 is about 50.6170210460.

The spelling of 129685 in words is "one hundred twenty-nine thousand, six hundred eighty-five".