12744721 has 4 divisors (see below), whose sum is σ = 13903344. Its totient is φ = 11586100.

The previous prime is 12744709. The next prime is 12744749.

12744721 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 12744721 - 2⁹ = 12744209 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12744721.

It is not an unprimeable number, because it can be changed into a prime (12744701) 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, 579295 + ... + 579316.

It is an arithmetic number, because the mean of its divisors is an integer number (3475836).

Almost surely, 2^12744721 is an apocalyptic number.

12744721 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12744721 is a deficient number, since it is larger than the sum of its proper divisors (1158623).

12744721 is a wasteful number, since it uses less digits than its factorization.

12744721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1158622.

The product of its digits is 3136, while the sum is 28.

The square root of 12744721 is about 3569.9749298840. The cubic root of 12744721 is about 233.5841898449.

It can be divided in two parts, 1274 and 4721, that added together give a palindrome (5995).

The spelling of 12744721 in words is "twelve million, seven hundred forty-four thousand, seven hundred twenty-one".