6724721 has 2 divisors, whose sum is σ = 6724722. Its totient is φ = 6724720.

The previous prime is 6724709. The next prime is 6724747. The reversal of 6724721 is 1274276.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6250000 + 474721 = 2500^2 + 689^2 .

It is a cyclic number.

It is not a de Polignac number, because 6724721 - 2¹⁰ = 6723697 is a prime.

It is not a weakly prime, because it can be changed into another prime (6724771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3362360 + 3362361.

It is an arithmetic number, because the mean of its divisors is an integer number (3362361).

Almost surely, 2^6724721 is an apocalyptic number.

It is an amenable number.

6724721 is a deficient number, since it is larger than the sum of its proper divisors (1).

6724721 is an equidigital number, since it uses as much as digits as its factorization.

6724721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4704, while the sum is 29.

The square root of 6724721 is about 2593.2067021354. The cubic root of 6724721 is about 188.7519398073.

Adding to 6724721 its reverse (1274276), we get a palindrome (7998997).

The spelling of 6724721 in words is "six million, seven hundred twenty-four thousand, seven hundred twenty-one".