12748321 has 8 divisors (see below), whose sum is σ = 13000104. Its totient is φ = 12499200.

The previous prime is 12748289. The next prime is 12748343. The reversal of 12748321 is 12384721.

It can be written as a sum of positive squares in 4 ways, for example, as 67600 + 12680721 = 260^2 + 3561^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 12748321 - 2⁵ = 12748289 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 12748321.

It is not an unprimeable number, because it can be changed into a prime (12748361) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10855 + ... + 11971.

It is an arithmetic number, because the mean of its divisors is an integer number (1625013).

Almost surely, 2^12748321 is an apocalyptic number.

It is an amenable number.

12748321 is a deficient number, since it is larger than the sum of its proper divisors (251783).

12748321 is a wasteful number, since it uses less digits than its factorization.

12748321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1331.

The product of its digits is 2688, while the sum is 28.

The square root of 12748321 is about 3570.4790995047. The cubic root of 12748321 is about 233.6061812749.

The spelling of 12748321 in words is "twelve million, seven hundred forty-eight thousand, three hundred twenty-one".