805999 has 8 divisors (see below), whose sum is σ = 864000. Its totient is φ = 749592.

The previous prime is 805991. The next prime is 806009. The reversal of 805999 is 999508.

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 805999 - 2³ = 805991 is a prime.

It is a Duffinian number.

805999 is a modest number, since divided by 999 gives 805 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (805991) 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 7 ways as a sum of consecutive naturals, for example, 762 + ... + 1480.

It is an arithmetic number, because the mean of its divisors is an integer number (108000).

2⁸⁰⁵⁹⁹⁹ is an apocalyptic number.

805999 is a deficient number, since it is larger than the sum of its proper divisors (58001).

805999 is a wasteful number, since it uses less digits than its factorization.

805999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 797.

The product of its (nonzero) digits is 29160, while the sum is 40.

The square root of 805999 is about 897.7744705660. The cubic root of 805999 is about 93.0632398331.

It can be divided in two parts, 80599 and 9, that added together give a palindrome (80608).

The spelling of 805999 in words is "eight hundred five thousand, nine hundred ninety-nine".