805565 has 8 divisors (see below), whose sum is σ = 971520. Its totient is φ = 641232.

The previous prime is 805559. The next prime is 805573. The reversal of 805565 is 565508.

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 805565 - 2⁶ = 805501 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 1616 + ... + 2054.

It is an arithmetic number, because the mean of its divisors is an integer number (121440).

2⁸⁰⁵⁵⁶⁵ is an apocalyptic number.

It is an amenable number.

805565 is a deficient number, since it is larger than the sum of its proper divisors (165955).

805565 is a wasteful number, since it uses less digits than its factorization.

805565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 811.

The product of its (nonzero) digits is 6000, while the sum is 29.

The square root of 805565 is about 897.5327292082. The cubic root of 805565 is about 93.0465331549.

The spelling of 805565 in words is "eight hundred five thousand, five hundred sixty-five".