12071986 has 4 divisors (see below), whose sum is σ = 18107982. Its totient is φ = 6035992.

The previous prime is 12071981. The next prime is 12072001. The reversal of 12071986 is 68917021.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 68917021 = 29 ⋅2376449.

It can be written as a sum of positive squares in only one way, i.e., 12033961 + 38025 = 3469^2 + 195^2 .

It is not an unprimeable number, because it can be changed into a prime (12071981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3017995 + ... + 3017998.

Almost surely, 2^12071986 is an apocalyptic number.

12071986 is a deficient number, since it is larger than the sum of its proper divisors (6035996).

12071986 is an equidigital number, since it uses as much as digits as its factorization.

12071986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6035995.

The product of its (nonzero) digits is 6048, while the sum is 34.

The square root of 12071986 is about 3474.4763634251. The cubic root of 12071986 is about 229.3997327977.

The spelling of 12071986 in words is "twelve million, seventy-one thousand, nine hundred eighty-six".