805843 has 2 divisors, whose sum is σ = 805844. Its totient is φ = 805842.

The previous prime is 805811. The next prime is 805853. The reversal of 805843 is 348508.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 805843 - 2⁵ = 805811 is a prime.

It is equal to p₆₄₃₈₇ and since 805843 and 64387 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (805853) 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 as a sum of consecutive naturals, namely, 402921 + 402922.

It is an arithmetic number, because the mean of its divisors is an integer number (402922).

2⁸⁰⁵⁸⁴³ is an apocalyptic number.

805843 is a deficient number, since it is larger than the sum of its proper divisors (1).

805843 is an equidigital number, since it uses as much as digits as its factorization.

805843 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3840, while the sum is 28.

The square root of 805843 is about 897.6875848534. The cubic root of 805843 is about 93.0572353582.

Subtracting from 805843 its sum of digits (28), we obtain a triangular number (805815 = T₁₂₆₉).

The spelling of 805843 in words is "eight hundred five thousand, eight hundred forty-three".