12396721 has 8 divisors (see below), whose sum is σ = 13197600. Its totient is φ = 11610720.

The previous prime is 12396707. The next prime is 12396731. The reversal of 12396721 is 12769321.

12396721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 12396721 - 2¹¹ = 12394673 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12396731) 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, 1975 + ... + 5356.

It is an arithmetic number, because the mean of its divisors is an integer number (1649700).

Almost surely, 2^12396721 is an apocalyptic number.

It is an amenable number.

12396721 is a deficient number, since it is larger than the sum of its proper divisors (800879).

12396721 is an equidigital number, since it uses as much as digits as its factorization.

12396721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7439.

The product of its digits is 4536, while the sum is 31.

The square root of 12396721 is about 3520.8977548347. The cubic root of 12396721 is about 231.4385016714.

The spelling of 12396721 in words is "twelve million, three hundred ninety-six thousand, seven hundred twenty-one".