744391 has 2 divisors, whose sum is σ = 744392. Its totient is φ = 744390.

The previous prime is 744389. The next prime is 744397. The reversal of 744391 is 193447.

It is a weak prime.

It is an emirp because it is prime and its reverse (193447) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 744391 - 2¹ = 744389 is a prime.

Together with 744389, it forms a pair of twin primes.

744391 is a lucky number.

It is a nialpdrome in base 15.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (744397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 372195 + 372196.

It is an arithmetic number, because the mean of its divisors is an integer number (372196).

2⁷⁴⁴³⁹¹ is an apocalyptic number.

744391 is a deficient number, since it is larger than the sum of its proper divisors (1).

744391 is an equidigital number, since it uses as much as digits as its factorization.

744391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3024, while the sum is 28.

The square root of 744391 is about 862.7809687284. The cubic root of 744391 is about 90.6289686728.

It can be divided in two parts, 74 and 4391, that added together give a triangular number (4465 = T₉₄).

The spelling of 744391 in words is "seven hundred forty-four thousand, three hundred ninety-one".