869985 has 12 divisors (see below), whose sum is σ = 1508052. Its totient is φ = 463968.

The previous prime is 869983. The next prime is 869989. The reversal of 869985 is 589968.

It can be written as a sum of positive squares in 2 ways, for example, as 603729 + 266256 = 777^2 + 516^2 .

It is not a de Polignac number, because 869985 - 2¹ = 869983 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 19333 = 869985 / (8 + 6 + 9 + 9 + 8 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 869985.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 869985.

It is not an unprimeable number, because it can be changed into a prime (869983) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9622 + ... + 9711.

It is an arithmetic number, because the mean of its divisors is an integer number (125671).

2⁸⁶⁹⁹⁸⁵ is an apocalyptic number.

It is an amenable number.

869985 is a deficient number, since it is larger than the sum of its proper divisors (638067).

869985 is a wasteful number, since it uses less digits than its factorization.

869985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19344 (or 19341 counting only the distinct ones).

The product of its digits is 155520, while the sum is 45.

The square root of 869985 is about 932.7298644302. The cubic root of 869985 is about 95.4634784466.

The spelling of 869985 in words is "eight hundred sixty-nine thousand, nine hundred eighty-five".