869665 has 4 divisors (see below), whose sum is σ = 1043604. Its totient is φ = 695728.

The previous prime is 869663. The next prime is 869683. The reversal of 869665 is 566968.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 589824 + 279841 = 768^2 + 529^2 .

It is a cyclic number.

It is not a de Polignac number, because 869665 - 2¹ = 869663 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (869663) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 86962 + ... + 86971.

It is an arithmetic number, because the mean of its divisors is an integer number (260901).

2⁸⁶⁹⁶⁶⁵ is an apocalyptic number.

It is an amenable number.

869665 is a deficient number, since it is larger than the sum of its proper divisors (173939).

869665 is a wasteful number, since it uses less digits than its factorization.

869665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173938.

The product of its digits is 77760, while the sum is 40.

The square root of 869665 is about 932.5583091689. The cubic root of 869665 is about 95.4517724749.

The spelling of 869665 in words is "eight hundred sixty-nine thousand, six hundred sixty-five".