11813866 has 4 divisors (see below), whose sum is σ = 17720802. Its totient is φ = 5906932.

The previous prime is 11813849. The next prime is 11813887. The reversal of 11813866 is 66831811.

11813866 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: 66831811 = 17 ⋅3931283.

It can be written as a sum of positive squares in only one way, i.e., 11799225 + 14641 = 3435^2 + 121^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2953465 + ... + 2953468.

Almost surely, 2^11813866 is an apocalyptic number.

11813866 is a deficient number, since it is larger than the sum of its proper divisors (5906936).

11813866 is an equidigital number, since it uses as much as digits as its factorization.

11813866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5906935.

The product of its digits is 6912, while the sum is 34.

The square root of 11813866 is about 3437.1304892308. The cubic root of 11813866 is about 227.7529513471.

The spelling of 11813866 in words is "eleven million, eight hundred thirteen thousand, eight hundred sixty-six".