129865 has 8 divisors (see below), whose sum is σ = 164160. Its totient is φ = 98352.

The previous prime is 129853. The next prime is 129887. The reversal of 129865 is 568921.

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 129865 - 2⁷ = 129737 is a prime.

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, 589 + ... + 778.

It is an arithmetic number, because the mean of its divisors is an integer number (20520).

2¹²⁹⁸⁶⁵ is an apocalyptic number.

It is an amenable number.

129865 is a deficient number, since it is larger than the sum of its proper divisors (34295).

129865 is a wasteful number, since it uses less digits than its factorization.

129865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1391.

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

The square root of 129865 is about 360.3678676020. The cubic root of 129865 is about 50.6404286663.

The spelling of 129865 in words is "one hundred twenty-nine thousand, eight hundred sixty-five".