744507409 has 2 divisors, whose sum is σ = 744507410. Its totient is φ = 744507408.

The previous prime is 744507373. The next prime is 744507443. The reversal of 744507409 is 904705447.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 392832400 + 351675009 = 19820^2 + 18753^2 .

It is an emirp because it is prime and its reverse (904705447) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 744507409 - 2²¹ = 742410257 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (744507499) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 372253704 + 372253705.

It is an arithmetic number, because the mean of its divisors is an integer number (372253705).

Almost surely, 2^744507409 is an apocalyptic number.

It is an amenable number.

744507409 is a deficient number, since it is larger than the sum of its proper divisors (1).

744507409 is an equidigital number, since it uses as much as digits as its factorization.

744507409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 141120, while the sum is 40.

The square root of 744507409 is about 27285.6630668928. The cubic root of 744507409 is about 906.3369265869.

The spelling of 744507409 in words is "seven hundred forty-four million, five hundred seven thousand, four hundred nine".