286805 has 8 divisors (see below), whose sum is σ = 362400. Its totient is φ = 217296.

The previous prime is 286801. The next prime is 286813. The reversal of 286805 is 508682.

286805 = 41² + 42² + ... + 97².

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 286805 - 2² = 286801 is a prime.

It is an Ulam number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 286805.

It is not an unprimeable number, because it can be changed into a prime (286801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1415 + ... + 1604.

It is an arithmetic number, because the mean of its divisors is an integer number (45300).

2²⁸⁶⁸⁰⁵ is an apocalyptic number.

It is an amenable number.

286805 is a deficient number, since it is larger than the sum of its proper divisors (75595).

286805 is a wasteful number, since it uses less digits than its factorization.

286805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3043.

The product of its (nonzero) digits is 3840, while the sum is 29.

The square root of 286805 is about 535.5417817500. The cubic root of 286805 is about 65.9470803222.

The spelling of 286805 in words is "two hundred eighty-six thousand, eight hundred five".