12748521 has 8 divisors (see below), whose sum is σ = 17997984. Its totient is φ = 7999040.

The previous prime is 12748513. The next prime is 12748553. The reversal of 12748521 is 12584721.

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 12748521 - 2³ = 12748513 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12748591) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 124935 + ... + 125036.

It is an arithmetic number, because the mean of its divisors is an integer number (2249748).

Almost surely, 2^12748521 is an apocalyptic number.

It is an amenable number.

12748521 is a deficient number, since it is larger than the sum of its proper divisors (5249463).

12748521 is a wasteful number, since it uses less digits than its factorization.

12748521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 249991.

The product of its digits is 4480, while the sum is 30.

The square root of 12748521 is about 3570.5071068407. The cubic root of 12748521 is about 233.6074028996.

The spelling of 12748521 in words is "twelve million, seven hundred forty-eight thousand, five hundred twenty-one".