12866815 has 12 divisors (see below), whose sum is σ = 16720344. Its totient is φ = 9501024.

The previous prime is 12866803. The next prime is 12866827. The reversal of 12866815 is 51866821.

It is an interprime number because it is at equal distance from previous prime (12866803) and next prime (12866827).

It is not a de Polignac number, because 12866815 - 2⁵ = 12866783 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 11 ways as a sum of consecutive naturals, for example, 6769 + ... + 8458.

It is an arithmetic number, because the mean of its divisors is an integer number (1393362).

Almost surely, 2^12866815 is an apocalyptic number.

12866815 is a deficient number, since it is larger than the sum of its proper divisors (3853529).

12866815 is a wasteful number, since it uses less digits than its factorization.

12866815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15258 (or 15245 counting only the distinct ones).

The product of its digits is 23040, while the sum is 37.

The square root of 12866815 is about 3587.0342903295. The cubic root of 12866815 is about 234.3277300818.

The spelling of 12866815 in words is "twelve million, eight hundred sixty-six thousand, eight hundred fifteen".