805285 has 12 divisors (see below), whose sum is σ = 1047492. Its totient is φ = 594048.

The previous prime is 805279. The next prime is 805289. The reversal of 805285 is 582508.

It can be written as a sum of positive squares in 6 ways, for example, as 187489 + 617796 = 433^2 + 786^2 .

It is not a de Polignac number, because 805285 - 2¹¹ = 803237 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (805289) 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, 369 + ... + 1321.

It is an arithmetic number, because the mean of its divisors is an integer number (87291).

2⁸⁰⁵²⁸⁵ is an apocalyptic number.

It is an amenable number.

805285 is a deficient number, since it is larger than the sum of its proper divisors (242207).

805285 is a wasteful number, since it uses less digits than its factorization.

805285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 984 (or 971 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 28.

The square root of 805285 is about 897.3767324820. The cubic root of 805285 is about 93.0357514682.

The spelling of 805285 in words is "eight hundred five thousand, two hundred eighty-five".