11891866 has 8 divisors (see below), whose sum is σ = 20386080. Its totient is φ = 5096508.

The previous prime is 11891833. The next prime is 11891917. The reversal of 11891866 is 66819811.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 424696 + ... + 424723.

It is an arithmetic number, because the mean of its divisors is an integer number (2548260).

Almost surely, 2^11891866 is an apocalyptic number.

11891866 is a deficient number, since it is larger than the sum of its proper divisors (8494214).

11891866 is an equidigital number, since it uses as much as digits as its factorization.

11891866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 849428.

The product of its digits is 20736, while the sum is 40.

The square root of 11891866 is about 3448.4584961980. The cubic root of 11891866 is about 228.2530917838.

The spelling of 11891866 in words is "eleven million, eight hundred ninety-one thousand, eight hundred sixty-six".