12864855 has 16 divisors (see below), whose sum is σ = 20744064. Its totient is φ = 6807840.

The previous prime is 12864853. The next prime is 12864877. The reversal of 12864855 is 55846821.

12864855 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12864855 - 2¹ = 12864853 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12864851) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1309 + ... + 5238.

It is an arithmetic number, because the mean of its divisors is an integer number (1296504).

Almost surely, 2^12864855 is an apocalyptic number.

12864855 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

12864855 is a deficient number, since it is larger than the sum of its proper divisors (7879209).

12864855 is a wasteful number, since it uses less digits than its factorization.

12864855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6686.

The product of its digits is 76800, while the sum is 39.

The square root of 12864855 is about 3586.7610737265. The cubic root of 12864855 is about 234.3158311083.

The spelling of 12864855 in words is "twelve million, eight hundred sixty-four thousand, eight hundred fifty-five".