12986566 has 4 divisors (see below), whose sum is σ = 19479852. Its totient is φ = 6493282.

The previous prime is 12986563. The next prime is 12986579. The reversal of 12986566 is 66568921.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12986563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3246640 + ... + 3246643.

It is an arithmetic number, because the mean of its divisors is an integer number (4869963).

Almost surely, 2^12986566 is an apocalyptic number.

12986566 is a deficient number, since it is larger than the sum of its proper divisors (6493286).

12986566 is an equidigital number, since it uses as much as digits as its factorization.

12986566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6493285.

The product of its digits is 155520, while the sum is 43.

The square root of 12986566 is about 3603.6878333174. The cubic root of 12986566 is about 235.0524464202.

The spelling of 12986566 in words is "twelve million, nine hundred eighty-six thousand, five hundred sixty-six".