805861 has 4 divisors (see below), whose sum is σ = 920992. Its totient is φ = 690732.

The previous prime is 805859. The next prime is 805867. The reversal of 805861 is 168508.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 805861 - 2¹ = 805859 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 (805867) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 57555 + ... + 57568.

It is an arithmetic number, because the mean of its divisors is an integer number (230248).

2⁸⁰⁵⁸⁶¹ is an apocalyptic number.

It is an amenable number.

805861 is a deficient number, since it is larger than the sum of its proper divisors (115131).

805861 is a wasteful number, since it uses less digits than its factorization.

805861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115130.

The product of its (nonzero) digits is 1920, while the sum is 28.

The square root of 805861 is about 897.6976105571. The cubic root of 805861 is about 93.0579282218.

The spelling of 805861 in words is "eight hundred five thousand, eight hundred sixty-one".