13085866 has 4 divisors (see below), whose sum is σ = 19628802. Its totient is φ = 6542932.

The previous prime is 13085861. The next prime is 13085867. The reversal of 13085866 is 66858031.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 66858031 = 5653 ⋅11827.

It can be written as a sum of positive squares in only one way, i.e., 12453841 + 632025 = 3529^2 + 795^2 .

It is not an unprimeable number, because it can be changed into a prime (13085861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3271465 + ... + 3271468.

Almost surely, 2^13085866 is an apocalyptic number.

13085866 is a deficient number, since it is larger than the sum of its proper divisors (6542936).

13085866 is an equidigital number, since it uses as much as digits as its factorization.

13085866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6542935.

The product of its (nonzero) digits is 34560, while the sum is 37.

The square root of 13085866 is about 3617.4391494537. The cubic root of 13085866 is about 235.6500246882.

The spelling of 13085866 in words is "thirteen million, eighty-five thousand, eight hundred sixty-six".