12986642 has 4 divisors (see below), whose sum is σ = 19479966. Its totient is φ = 6493320.

The previous prime is 12986609. The next prime is 12986647. The reversal of 12986642 is 24668921.

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., 9296401 + 3690241 = 3049^2 + 1921^2 .

It is a junction number, because it is equal to n+sod(n) for n = 12986596 and 12986605.

It is not an unprimeable number, because it can be changed into a prime (12986647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3246659 + ... + 3246662.

Almost surely, 2^12986642 is an apocalyptic number.

12986642 is a deficient number, since it is larger than the sum of its proper divisors (6493324).

12986642 is an equidigital number, since it uses as much as digits as its factorization.

12986642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6493323.

The product of its digits is 41472, while the sum is 38.

The square root of 12986642 is about 3603.6983780555. The cubic root of 12986642 is about 235.0529049440.

The spelling of 12986642 in words is "twelve million, nine hundred eighty-six thousand, six hundred forty-two".