11945866 has 16 divisors (see below), whose sum is σ = 19236744. Its totient is φ = 5543424.

The previous prime is 11945861. The next prime is 11945867. The reversal of 11945866 is 66854911.

11945866 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 11868025 + 77841 = 3445^2 + 279^2 .

It is not an unprimeable number, because it can be changed into a prime (11945861) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 76 + ... + 4888.

Almost surely, 2^11945866 is an apocalyptic number.

11945866 is a deficient number, since it is larger than the sum of its proper divisors (7290878).

11945866 is a wasteful number, since it uses less digits than its factorization.

11945866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4905.

The product of its digits is 51840, while the sum is 40.

The square root of 11945866 is about 3456.2792132581. The cubic root of 11945866 is about 228.5980630793.

The spelling of 11945866 in words is "eleven million, nine hundred forty-five thousand, eight hundred sixty-six".