12727681 has 4 divisors (see below), whose sum is σ = 12764500. Its totient is φ = 12690864.

The previous prime is 12727651. The next prime is 12727697. The reversal of 12727681 is 18672721.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6890625 + 5837056 = 2625^2 + 2416^2 .

It is a cyclic number.

It is not a de Polignac number, because 12727681 - 2¹³ = 12719489 is a prime.

It is a super-2 number, since 2×12727681² = 323987727275522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12727601) 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, 17886 + ... + 18583.

It is an arithmetic number, because the mean of its divisors is an integer number (3191125).

Almost surely, 2^12727681 is an apocalyptic number.

It is an amenable number.

12727681 is a deficient number, since it is larger than the sum of its proper divisors (36819).

12727681 is an equidigital number, since it uses as much as digits as its factorization.

12727681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36818.

The product of its digits is 9408, while the sum is 34.

The square root of 12727681 is about 3567.5875602429. The cubic root of 12727681 is about 233.4800408454.

The spelling of 12727681 in words is "twelve million, seven hundred twenty-seven thousand, six hundred eighty-one".