12881866 has 4 divisors (see below), whose sum is σ = 19322802. Its totient is φ = 6440932.

The previous prime is 12881839. The next prime is 12881899. The reversal of 12881866 is 66818821.

12881866 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 66818821 = 113 ⋅591317.

It can be written as a sum of positive squares in only one way, i.e., 12496225 + 385641 = 3535^2 + 621^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3220465 + ... + 3220468.

Almost surely, 2^12881866 is an apocalyptic number.

12881866 is a deficient number, since it is larger than the sum of its proper divisors (6440936).

12881866 is an equidigital number, since it uses as much as digits as its factorization.

12881866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6440935.

The product of its digits is 36864, while the sum is 40.

The square root of 12881866 is about 3589.1316498563. The cubic root of 12881866 is about 234.4190630281.

The spelling of 12881866 in words is "twelve million, eight hundred eighty-one thousand, eight hundred sixty-six".