12810815 has 4 divisors (see below), whose sum is σ = 15372984. Its totient is φ = 10248648.

The previous prime is 12810799. The next prime is 12810821. The reversal of 12810815 is 51801821.

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

It is a cyclic number.

It is not a de Polignac number, because 12810815 - 2⁴ = 12810799 is a prime.

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, 1281077 + ... + 1281086.

It is an arithmetic number, because the mean of its divisors is an integer number (3843246).

Almost surely, 2^12810815 is an apocalyptic number.

12810815 is a deficient number, since it is larger than the sum of its proper divisors (2562169).

12810815 is an equidigital number, since it uses as much as digits as its factorization.

12810815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2562168.

The product of its (nonzero) digits is 640, while the sum is 26.

The square root of 12810815 is about 3579.2198870704. The cubic root of 12810815 is about 233.9872822854.

The spelling of 12810815 in words is "twelve million, eight hundred ten thousand, eight hundred fifteen".