868209 has 8 divisors (see below), whose sum is σ = 1163232. Its totient is φ = 576000.

The previous prime is 868199. The next prime is 868211. The reversal of 868209 is 902868.

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

It is not a de Polignac number, because 868209 - 2⁵ = 868177 is a prime.

It is a super-3 number, since 3×868209³ = 1963333627807359987, which contains 333 as substring.

It is a Curzon number.

It is a nialpdrome in base 11.

It is a self number, because there is not a number n which added to its sum of digits gives 868209.

It is not an unprimeable number, because it can be changed into a prime (868229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 177 + ... + 1329.

It is an arithmetic number, because the mean of its divisors is an integer number (145404).

2⁸⁶⁸²⁰⁹ is an apocalyptic number.

It is an amenable number.

868209 is a deficient number, since it is larger than the sum of its proper divisors (295023).

868209 is a wasteful number, since it uses less digits than its factorization.

868209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1407.

The product of its (nonzero) digits is 6912, while the sum is 33.

The square root of 868209 is about 931.7773339162. Note that the first 3 decimals coincide. The cubic root of 868209 is about 95.3984740163.

The spelling of 868209 in words is "eight hundred sixty-eight thousand, two hundred nine".