805939845 has 16 divisors (see below), whose sum is σ = 1290716160. Its totient is φ = 429430464.

The previous prime is 805939837. The next prime is 805939861. The reversal of 805939845 is 548939508.

It is a happy number.

It is not a de Polignac number, because 805939845 - 2³ = 805939837 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 15 ways as a sum of consecutive naturals, for example, 8410 + ... + 41019.

It is an arithmetic number, because the mean of its divisors is an integer number (80669760).

Almost surely, 2^805939845 is an apocalyptic number.

It is an amenable number.

805939845 is a deficient number, since it is larger than the sum of its proper divisors (484776315).

805939845 is a wasteful number, since it uses less digits than its factorization.

805939845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50524.

The product of its (nonzero) digits is 1555200, while the sum is 51.

The square root of 805939845 is about 28389.0796786370. The cubic root of 805939845 is about 930.6096303512.

The spelling of 805939845 in words is "eight hundred five million, nine hundred thirty-nine thousand, eight hundred forty-five".