856943823 has 16 divisors (see below), whose sum is σ = 1182960000. Its totient is φ = 551144160.

The previous prime is 856943807. The next prime is 856943831. The reversal of 856943823 is 328349658.

It is not a de Polignac number, because 856943823 - 2⁴ = 856943807 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (856943873) 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, 127128 + ... + 133698.

It is an arithmetic number, because the mean of its divisors is an integer number (73935000).

Almost surely, 2^856943823 is an apocalyptic number.

856943823 is a deficient number, since it is larger than the sum of its proper divisors (326016177).

856943823 is a wasteful number, since it uses less digits than its factorization.

856943823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8102.

The product of its digits is 1244160, while the sum is 48.

The square root of 856943823 is about 29273.6028360023. The cubic root of 856943823 is about 949.8407204800.

The spelling of 856943823 in words is "eight hundred fifty-six million, nine hundred forty-three thousand, eight hundred twenty-three".