868909 has 2 divisors, whose sum is σ = 868910. Its totient is φ = 868908.

The previous prime is 868891. The next prime is 868937. The reversal of 868909 is 909868.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 837225 + 31684 = 915^2 + 178^2 .

It is a cyclic number.

It is not a de Polignac number, because 868909 - 2⁵ = 868877 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (868939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 434454 + 434455.

It is an arithmetic number, because the mean of its divisors is an integer number (434455).

2⁸⁶⁸⁹⁰⁹ is an apocalyptic number.

It is an amenable number.

868909 is a deficient number, since it is larger than the sum of its proper divisors (1).

868909 is an equidigital number, since it uses as much as digits as its factorization.

868909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 31104, while the sum is 40.

The square root of 868909 is about 932.1528844562. The cubic root of 868909 is about 95.4241057067.

The spelling of 868909 in words is "eight hundred sixty-eight thousand, nine hundred nine".