869689 has 2 divisors, whose sum is σ = 869690. Its totient is φ = 869688.

The previous prime is 869683. The next prime is 869707. The reversal of 869689 is 986968.

It is a happy number.

869689 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 779689 + 90000 = 883^2 + 300^2 .

It is a cyclic number.

It is not a de Polignac number, because 869689 - 2⁵ = 869657 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (869683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 434844 + 434845.

It is an arithmetic number, because the mean of its divisors is an integer number (434845).

2⁸⁶⁹⁶⁸⁹ is an apocalyptic number.

It is an amenable number.

869689 is a deficient number, since it is larger than the sum of its proper divisors (1).

869689 is an equidigital number, since it uses as much as digits as its factorization.

869689 is an evil number, because the sum of its binary digits is even.

The product of its digits is 186624, while the sum is 46.

The square root of 869689 is about 932.5711769082. The cubic root of 869689 is about 95.4526505224.

The spelling of 869689 in words is "eight hundred sixty-nine thousand, six hundred eighty-nine".