12856823 has 4 divisors (see below), whose sum is σ = 14693520. Its totient is φ = 11020128.

The previous prime is 12856813. The next prime is 12856849. The reversal of 12856823 is 32865821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32865821 = 1051 ⋅31271.

It is not a de Polignac number, because 12856823 - 2⁶ = 12856759 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12856813) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 918338 + ... + 918351.

It is an arithmetic number, because the mean of its divisors is an integer number (3673380).

Almost surely, 2^12856823 is an apocalyptic number.

12856823 is a deficient number, since it is larger than the sum of its proper divisors (1836697).

12856823 is an equidigital number, since it uses as much as digits as its factorization.

12856823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1836696.

The product of its digits is 23040, while the sum is 35.

The square root of 12856823 is about 3585.6412257782. The cubic root of 12856823 is about 234.2670569722.

The spelling of 12856823 in words is "twelve million, eight hundred fifty-six thousand, eight hundred twenty-three".