12165986 has 8 divisors (see below), whose sum is σ = 20856000. Its totient is φ = 5213988.

The previous prime is 12165983. The next prime is 12166013. The reversal of 12165986 is 68956121.

12165986 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a super-2 number, since 2×12165986² = 296022430704392, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12165983) 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, 434486 + ... + 434513.

It is an arithmetic number, because the mean of its divisors is an integer number (2607000).

Almost surely, 2^12165986 is an apocalyptic number.

12165986 is a deficient number, since it is larger than the sum of its proper divisors (8690014).

12165986 is an equidigital number, since it uses as much as digits as its factorization.

12165986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 869008.

The product of its digits is 25920, while the sum is 38.

The square root of 12165986 is about 3487.9773508439. The cubic root of 12165986 is about 229.9936104085.

The spelling of 12165986 in words is "twelve million, one hundred sixty-five thousand, nine hundred eighty-six".