12866856 has 32 divisors (see below), whose sum is σ = 32504640. Its totient is φ = 4243968.

The previous prime is 12866851. The next prime is 12866869. The reversal of 12866856 is 65866821.

It is a super-3 number, since 3×12866856³ (a number of 22 digits) contains 333 as substring.

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

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 436 + ... + 5091.

It is an arithmetic number, because the mean of its divisors is an integer number (1015770).

Almost surely, 2^12866856 is an apocalyptic number.

It is an amenable number.

12866856 is an abundant number, since it is smaller than the sum of its proper divisors (19637784).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12866856 is a wasteful number, since it uses less digits than its factorization.

12866856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5633 (or 5629 counting only the distinct ones).

The product of its digits is 138240, while the sum is 42.

The square root of 12866856 is about 3587.0400053526. The cubic root of 12866856 is about 234.3279789760.

The spelling of 12866856 in words is "twelve million, eight hundred sixty-six thousand, eight hundred fifty-six".