868985 has 16 divisors (see below), whose sum is σ = 1164240. Its totient is φ = 618240.

The previous prime is 868957. The next prime is 868993. The reversal of 868985 is 589868.

868985 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 8 ways, for example, as 99856 + 769129 = 316^2 + 877^2 .

It is not a de Polignac number, because 868985 - 2¹⁶ = 803449 is a prime.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 868985.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1655 + ... + 2115.

It is an arithmetic number, because the mean of its divisors is an integer number (72765).

2⁸⁶⁸⁹⁸⁵ is an apocalyptic number.

It is an amenable number.

868985 is a deficient number, since it is larger than the sum of its proper divisors (295255).

868985 is a wasteful number, since it uses less digits than its factorization.

868985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 508.

The product of its digits is 138240, while the sum is 44.

The square root of 868985 is about 932.1936494098. The cubic root of 868985 is about 95.4268877473.

The spelling of 868985 in words is "eight hundred sixty-eight thousand, nine hundred eighty-five".