11986 has 8 divisors (see below), whose sum is σ = 19404.
Its totient is φ = 5520.
The previous prime is 11981. The next prime is 11987. The reversal of 11986 is 68911.
It can be written as a sum of positive squares in 2 ways, for example, as 11025 + 961 = 105^2 + 31^2
It is a sphenic number, since it is the product of 3 distinct primes.
It is a self number, because there is not a number n which added to its sum of digits gives 11986.
It is not an unprimeable number, because it can be changed into a prime (11981) by changing a digit.
It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 205 + ... + 256.
211986 is an apocalyptic number.
11986 is a deficient number, since it is larger than the sum of its proper divisors (7418).
11986 is a wasteful number, since it uses less digits than its factorization.
11986 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 476.
The product of its digits is 432, while the sum is 25.
The square root of 11986 is about 109.4805918873.
The cubic root of 11986 is about 22.8853780534.
The spelling of 11986 in words is "eleven thousand, nine hundred eighty-six".