805855 has 8 divisors (see below), whose sum is σ = 990864. Its totient is φ = 628800.

The previous prime is 805853. The next prime is 805859. The reversal of 805855 is 558508.

It is a happy number.

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

It is not a de Polignac number, because 805855 - 2¹ = 805853 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 (805853) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1761 + ... + 2170.

It is an arithmetic number, because the mean of its divisors is an integer number (123858).

2⁸⁰⁵⁸⁵⁵ is an apocalyptic number.

805855 is a deficient number, since it is larger than the sum of its proper divisors (185009).

805855 is a wasteful number, since it uses less digits than its factorization.

805855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3977.

The product of its (nonzero) digits is 8000, while the sum is 31.

The square root of 805855 is about 897.6942686683. The cubic root of 805855 is about 93.0576972684.

The spelling of 805855 in words is "eight hundred five thousand, eight hundred fifty-five".