744721 has 2 divisors, whose sum is σ = 744722. Its totient is φ = 744720.

The previous prime is 744707. The next prime is 744727. The reversal of 744721 is 127447.

744721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 408321 + 336400 = 639^2 + 580^2 .

It is an emirp because it is prime and its reverse (127447) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 744721 - 2¹¹ = 742673 is a prime.

It is not a weakly prime, because it can be changed into another prime (744727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 372360 + 372361.

It is an arithmetic number, because the mean of its divisors is an integer number (372361).

2⁷⁴⁴⁷²¹ is an apocalyptic number.

It is an amenable number.

744721 is a deficient number, since it is larger than the sum of its proper divisors (1).

744721 is an equidigital number, since it uses as much as digits as its factorization.

744721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1568, while the sum is 25.

The square root of 744721 is about 862.9721895867. The cubic root of 744721 is about 90.6423591004.

The spelling of 744721 in words is "seven hundred forty-four thousand, seven hundred twenty-one", and thus it is an iban number.