12866855 has 8 divisors (see below), whose sum is σ = 15466464. Its totient is φ = 10276000.

The previous prime is 12866851. The next prime is 12866869. The reversal of 12866855 is 55866821.

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

It is not a de Polignac number, because 12866855 - 2² = 12866851 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12866851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1670 + ... + 5340.

It is an arithmetic number, because the mean of its divisors is an integer number (1933308).

Almost surely, 2^12866855 is an apocalyptic number.

12866855 is a deficient number, since it is larger than the sum of its proper divisors (2599609).

12866855 is an equidigital number, since it uses as much as digits as its factorization.

12866855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4377.

The product of its digits is 115200, while the sum is 41.

The square root of 12866855 is about 3587.0398659619. The cubic root of 12866855 is about 234.3279729054.

The spelling of 12866855 in words is "twelve million, eight hundred sixty-six thousand, eight hundred fifty-five".