856823506 has 72 divisors (see below), whose sum is σ = 1730287440. Its totient is φ = 316174320.

The previous prime is 856823503. The next prime is 856823519. The reversal of 856823506 is 605328658.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (856823503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 223401 + ... + 227203.

It is an arithmetic number, because the mean of its divisors is an integer number (24031770).

Almost surely, 2^856823506 is an apocalyptic number.

856823506 is an abundant number, since it is smaller than the sum of its proper divisors (873463934).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

856823506 is a wasteful number, since it uses less digits than its factorization.

856823506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3860 (or 3842 counting only the distinct ones).

The product of its (nonzero) digits is 345600, while the sum is 43.

The square root of 856823506 is about 29271.5477212941. The cubic root of 856823506 is about 949.7962650825.

The spelling of 856823506 in words is "eight hundred fifty-six million, eight hundred twenty-three thousand, five hundred six".