12866978 has 8 divisors (see below), whose sum is σ = 19315920. Its totient is φ = 6428340.

The previous prime is 12866957. The next prime is 12866983. The reversal of 12866978 is 87966821.

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

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, 2753 + ... + 5771.

It is an arithmetic number, because the mean of its divisors is an integer number (2414490).

Almost surely, 2^12866978 is an apocalyptic number.

12866978 is a deficient number, since it is larger than the sum of its proper divisors (6448942).

12866978 is a wasteful number, since it uses less digits than its factorization.

12866978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5152.

The product of its digits is 290304, while the sum is 47.

The square root of 12866978 is about 3587.0570109771. The cubic root of 12866978 is about 234.3287195849.

It can be divided in two parts, 128 and 66978, that multiplied together give a square (8573184 = 2928²).

The spelling of 12866978 in words is "twelve million, eight hundred sixty-six thousand, nine hundred seventy-eight".