12731986 has 8 divisors (see below), whose sum is σ = 19756620. Its totient is φ = 6146448.

The previous prime is 12731969. The next prime is 12731987. The reversal of 12731986 is 68913721.

It can be written as a sum of positive squares in 2 ways, for example, as 12215025 + 516961 = 3495^2 + 719^2 .

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

It is not an unprimeable number, because it can be changed into a prime (12731987) 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, 109701 + ... + 109816.

Almost surely, 2^12731986 is an apocalyptic number.

12731986 is a deficient number, since it is larger than the sum of its proper divisors (7024634).

12731986 is a wasteful number, since it uses less digits than its factorization.

12731986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 219548.

The product of its digits is 18144, while the sum is 37.

The square root of 12731986 is about 3568.1908581240. The cubic root of 12731986 is about 233.5063619082.

The spelling of 12731986 in words is "twelve million, seven hundred thirty-one thousand, nine hundred eighty-six".