12971986 has 8 divisors (see below), whose sum is σ = 20602620. Its totient is φ = 6104448.

The previous prime is 12971971. The next prime is 12971993. The reversal of 12971986 is 68917921.

It can be written as a sum of positive squares in 2 ways, for example, as 12924025 + 47961 = 3595^2 + 219^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 190731 + ... + 190798.

Almost surely, 2^12971986 is an apocalyptic number.

12971986 is a deficient number, since it is larger than the sum of its proper divisors (7630634).

12971986 is a wasteful number, since it uses less digits than its factorization.

12971986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 381548.

The product of its digits is 54432, while the sum is 43.

The square root of 12971986 is about 3601.6643374973. The cubic root of 12971986 is about 234.9644491264.

The spelling of 12971986 in words is "twelve million, nine hundred seventy-one thousand, nine hundred eighty-six".