11817866 has 4 divisors (see below), whose sum is σ = 17726802. Its totient is φ = 5908932.

The previous prime is 11817863. The next prime is 11817893. The reversal of 11817866 is 66871811.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 66871811 = 19 ⋅3519569.

It can be written as a sum of positive squares in only one way, i.e., 6911641 + 4906225 = 2629^2 + 2215^2 .

It is not an unprimeable number, because it can be changed into a prime (11817863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2954465 + ... + 2954468.

Almost surely, 2^11817866 is an apocalyptic number.

11817866 is a deficient number, since it is larger than the sum of its proper divisors (5908936).

11817866 is an equidigital number, since it uses as much as digits as its factorization.

11817866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5908935.

The product of its digits is 16128, while the sum is 38.

The square root of 11817866 is about 3437.7123207156. The cubic root of 11817866 is about 227.7786530383.

The spelling of 11817866 in words is "eleven million, eight hundred seventeen thousand, eight hundred sixty-six".