12856005 has 24 divisors (see below), whose sum is σ = 22496760. Its totient is φ = 6791040.

The previous prime is 12855977. The next prime is 12856007. The reversal of 12856005 is 50065821.

It can be written as a sum of positive squares in 4 ways, for example, as 4088484 + 8767521 = 2022^2 + 2961^2 .

It is not a de Polignac number, because 12856005 - 2⁷ = 12855877 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12856005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12856007) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3595 + ... + 6215.

It is an arithmetic number, because the mean of its divisors is an integer number (937365).

Almost surely, 2^12856005 is an apocalyptic number.

12856005 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12856005 is a deficient number, since it is larger than the sum of its proper divisors (9640755).

12856005 is a wasteful number, since it uses less digits than its factorization.

12856005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2741 (or 2738 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 27.

The square root of 12856005 is about 3585.5271578946. The cubic root of 12856005 is about 234.2620885464.

The spelling of 12856005 in words is "twelve million, eight hundred fifty-six thousand, five".