856803805 has 24 divisors (see below), whose sum is σ = 1214563680. Its totient is φ = 575190720.

The previous prime is 856803799. The next prime is 856803821. The reversal of 856803805 is 508308658.

It is a de Polignac number, because none of the positive numbers 2^k-856803805 is a prime.

It is a super-2 number, since 2×856803805² = 1468225520524956050, which contains 22 as substring.

It is a Smith number, since the sum of its digits (43) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 36795 + ... + 55384.

It is an arithmetic number, because the mean of its divisors is an integer number (50606820).

Almost surely, 2^856803805 is an apocalyptic number.

It is an amenable number.

856803805 is a deficient number, since it is larger than the sum of its proper divisors (357759875).

856803805 is a wasteful number, since it uses less digits than its factorization.

856803805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92221 (or 92208 counting only the distinct ones).

The product of its (nonzero) digits is 230400, while the sum is 43.

The square root of 856803805 is about 29271.2111980355. The cubic root of 856803805 is about 949.7889854504.

The spelling of 856803805 in words is "eight hundred fifty-six million, eight hundred three thousand, eight hundred five".