11989866 has 16 divisors (see below), whose sum is σ = 27405504. Its totient is φ = 3425664.

The previous prime is 11989837. The next prime is 11989883. The reversal of 11989866 is 66898911.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 142695 + ... + 142778.

It is an arithmetic number, because the mean of its divisors is an integer number (1712844).

Almost surely, 2^11989866 is an apocalyptic number.

11989866 is an abundant number, since it is smaller than the sum of its proper divisors (15415638).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11989866 is a wasteful number, since it uses less digits than its factorization.

11989866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 285485.

The product of its digits is 186624, while the sum is 48.

The square root of 11989866 is about 3462.6385892842. The cubic root of 11989866 is about 228.8783829483.

The spelling of 11989866 in words is "eleven million, nine hundred eighty-nine thousand, eight hundred sixty-six".