12346721 has 12 divisors (see below), whose sum is σ = 13075452. Its totient is φ = 11653824.

The previous prime is 12346717. The next prime is 12346723. The reversal of 12346721 is 12764321.

12346721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 6 ways, for example, as 19600 + 12327121 = 140^2 + 3511^2 .

It is not a de Polignac number, because 12346721 - 2² = 12346717 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12346723) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 44435 + ... + 44711.

It is an arithmetic number, because the mean of its divisors is an integer number (1089621).

Almost surely, 2^12346721 is an apocalyptic number.

It is an amenable number.

12346721 is a deficient number, since it is larger than the sum of its proper divisors (728731).

12346721 is an equidigital number, since it uses as much as digits as its factorization.

12346721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 388 (or 359 counting only the distinct ones).

The product of its digits is 2016, while the sum is 26.

The square root of 12346721 is about 3513.7901189456. The cubic root of 12346721 is about 231.1269268656.

The spelling of 12346721 in words is "twelve million, three hundred forty-six thousand, seven hundred twenty-one".