12111986 has 4 divisors (see below), whose sum is σ = 18167982. Its totient is φ = 6055992.

The previous prime is 12111929. The next prime is 12111989. The reversal of 12111986 is 68911121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 9954025 + 2157961 = 3155^2 + 1469^2 .

It is not an unprimeable number, because it can be changed into a prime (12111989) 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, 3027995 + ... + 3027998.

Almost surely, 2^12111986 is an apocalyptic number.

12111986 is a deficient number, since it is larger than the sum of its proper divisors (6055996).

12111986 is an equidigital number, since it uses as much as digits as its factorization.

12111986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6055995.

The product of its digits is 864, while the sum is 29.

The square root of 12111986 is about 3480.2278661030. The cubic root of 12111986 is about 229.6528221452.

The spelling of 12111986 in words is "twelve million, one hundred eleven thousand, nine hundred eighty-six".