12721793 has 4 divisors (see below), whose sum is σ = 14539200. Its totient is φ = 10904388.

The previous prime is 12721789. The next prime is 12721799. The reversal of 12721793 is 39712721.

12721793 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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, and also an emirpimes, since its reverse is a distinct semiprime: 39712721 = 1583 ⋅25087.

It is a cyclic number.

It is not a de Polignac number, because 12721793 - 2² = 12721789 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12721799) 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, 908693 + ... + 908706.

It is an arithmetic number, because the mean of its divisors is an integer number (3634800).

Almost surely, 2^12721793 is an apocalyptic number.

It is an amenable number.

12721793 is a deficient number, since it is larger than the sum of its proper divisors (1817407).

12721793 is an equidigital number, since it uses as much as digits as its factorization.

12721793 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1817406.

The product of its digits is 5292, while the sum is 32.

The square root of 12721793 is about 3566.7622572860. The cubic root of 12721793 is about 233.4440316011. Note that the first 3 decimals are identical.

The spelling of 12721793 in words is "twelve million, seven hundred twenty-one thousand, seven hundred ninety-three".