7327721 has 2 divisors, whose sum is σ = 7327722. Its totient is φ = 7327720.

The previous prime is 7327709. The next prime is 7327751. The reversal of 7327721 is 1277237.

7327721 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6786025 + 541696 = 2605^2 + 736^2 .

It is a cyclic number.

It is not a de Polignac number, because 7327721 - 2⁶ = 7327657 is a prime.

It is not a weakly prime, because it can be changed into another prime (7327751) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3663860 + 3663861.

It is an arithmetic number, because the mean of its divisors is an integer number (3663861).

Almost surely, 2^7327721 is an apocalyptic number.

It is an amenable number.

7327721 is a deficient number, since it is larger than the sum of its proper divisors (1).

7327721 is an equidigital number, since it uses as much as digits as its factorization.

7327721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4116, while the sum is 29.

The square root of 7327721 is about 2706.9763574882. The cubic root of 7327721 is about 194.2329808017.

The spelling of 7327721 in words is "seven million, three hundred twenty-seven thousand, seven hundred twenty-one".