12810005 has 8 divisors (see below), whose sum is σ = 16554552. Its totient is φ = 9459648.

The previous prime is 12809987. The next prime is 12810013. The reversal of 12810005 is 50001821.

It can be written as a sum of positive squares in 4 ways, for example, as 1674436 + 11135569 = 1294^2 + 3337^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12810005 - 2¹⁸ = 12547861 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 98474 + ... + 98603.

It is an arithmetic number, because the mean of its divisors is an integer number (2069319).

Almost surely, 2^12810005 is an apocalyptic number.

It is an amenable number.

12810005 is a deficient number, since it is larger than the sum of its proper divisors (3744547).

12810005 is a wasteful number, since it uses less digits than its factorization.

12810005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 197095.

The product of its (nonzero) digits is 80, while the sum is 17.

The square root of 12810005 is about 3579.1067321330. The cubic root of 12810005 is about 233.9823506790.

Adding to 12810005 its reverse (50001821), we get a palindrome (62811826).

The spelling of 12810005 in words is "twelve million, eight hundred ten thousand, five".