868309 has 8 divisors (see below), whose sum is σ = 990360. Its totient is φ = 754176.

The previous prime is 868291. The next prime is 868313. The reversal of 868309 is 903868.

It can be written as a sum of positive squares in 4 ways, for example, as 18225 + 850084 = 135^2 + 922^2 .

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 868309 - 2⁵ = 868277 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (868349) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1744 + ... + 2185.

It is an arithmetic number, because the mean of its divisors is an integer number (123795).

2⁸⁶⁸³⁰⁹ is an apocalyptic number.

It is an amenable number.

868309 is a deficient number, since it is larger than the sum of its proper divisors (122051).

868309 is a wasteful number, since it uses less digits than its factorization.

868309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3959.

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 868309 is about 931.8309932600. The cubic root of 868309 is about 95.4021365296.

The spelling of 868309 in words is "eight hundred sixty-eight thousand, three hundred nine".