856740823 has 16 divisors (see below), whose sum is σ = 979231680. Its totient is φ = 744679936.

The previous prime is 856740803. The next prime is 856740851. The reversal of 856740823 is 328047658.

It is a cyclic number.

It is not a de Polignac number, because 856740823 - 2¹³ = 856732631 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 856740823.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (856740803) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26440 + ... + 49117.

It is an arithmetic number, because the mean of its divisors is an integer number (61201980).

Almost surely, 2^856740823 is an apocalyptic number.

856740823 is a deficient number, since it is larger than the sum of its proper divisors (122490857).

856740823 is a wasteful number, since it uses less digits than its factorization.

856740823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75626.

The product of its (nonzero) digits is 322560, while the sum is 43.

The square root of 856740823 is about 29270.1353430421. The cubic root of 856740823 is about 949.7657124929.

The spelling of 856740823 in words is "eight hundred fifty-six million, seven hundred forty thousand, eight hundred twenty-three".