985865 has 12 divisors (see below), whose sum is σ = 1231884. Its totient is φ = 756864.

The previous prime is 985819. The next prime is 985867. The reversal of 985865 is 568589.

It can be written as a sum of positive squares in 6 ways, for example, as 48841 + 937024 = 221^2 + 968^2 .

It is not a de Polignac number, because 985865 - 2¹² = 981769 is a prime.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 985865.

It is not an unprimeable number, because it can be changed into a prime (985867) 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, 13469 + ... + 13541.

It is an arithmetic number, because the mean of its divisors is an integer number (102657).

2⁹⁸⁵⁸⁶⁵ is an apocalyptic number.

It is an amenable number.

985865 is a deficient number, since it is larger than the sum of its proper divisors (246019).

985865 is an equidigital number, since it uses as much as digits as its factorization.

985865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 188 (or 115 counting only the distinct ones).

The product of its digits is 86400, while the sum is 41.

The square root of 985865 is about 992.9073471377. The cubic root of 985865 is about 99.5265957540.

The spelling of 985865 in words is "nine hundred eighty-five thousand, eight hundred sixty-five".