805855837 has 2 divisors, whose sum is σ = 805855838. Its totient is φ = 805855836.

The previous prime is 805855823. The next prime is 805855849. The reversal of 805855837 is 738558508.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 515698681 + 290157156 = 22709^2 + 17034^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-805855837 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (805855637) 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, 402927918 + 402927919.

It is an arithmetic number, because the mean of its divisors is an integer number (402927919).

Almost surely, 2^805855837 is an apocalyptic number.

It is an amenable number.

805855837 is a deficient number, since it is larger than the sum of its proper divisors (1).

805855837 is an equidigital number, since it uses as much as digits as its factorization.

805855837 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1344000, while the sum is 49.

The square root of 805855837 is about 28387.6000570672. The cubic root of 805855837 is about 930.5772948650.

The spelling of 805855837 in words is "eight hundred five million, eight hundred fifty-five thousand, eight hundred thirty-seven".