12806005 has 4 divisors (see below), whose sum is σ = 15367212. Its totient is φ = 10244800.

The previous prime is 12805993. The next prime is 12806041. The reversal of 12806005 is 50060821.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1790244 + 11015761 = 1338^2 + 3319^2 .

It is not a de Polignac number, because 12806005 - 2⁵ = 12805973 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1280596 + ... + 1280605.

It is an arithmetic number, because the mean of its divisors is an integer number (3841803).

Almost surely, 2^12806005 is an apocalyptic number.

It is an amenable number.

12806005 is a deficient number, since it is larger than the sum of its proper divisors (2561207).

12806005 is an equidigital number, since it uses as much as digits as its factorization.

12806005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2561206.

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 12806005 is about 3578.5478898570. The cubic root of 12806005 is about 233.9579940183.

Adding to 12806005 its reverse (50060821), we get a palindrome (62866826).

The spelling of 12806005 in words is "twelve million, eight hundred six thousand, five".