744638 has 8 divisors (see below), whose sum is σ = 1133832. Its totient is φ = 366696.

The previous prime is 744637. The next prime is 744641. The reversal of 744638 is 836447.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 744638.

It is not an unprimeable number, because it can be changed into a prime (744637) 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 in 3 ways as a sum of consecutive naturals, for example, 2645 + ... + 2912.

It is an arithmetic number, because the mean of its divisors is an integer number (141729).

2⁷⁴⁴⁶³⁸ is an apocalyptic number.

744638 is a deficient number, since it is larger than the sum of its proper divisors (389194).

744638 is a wasteful number, since it uses less digits than its factorization.

744638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5626.

The product of its digits is 16128, while the sum is 32.

The square root of 744638 is about 862.9240986321. The cubic root of 744638 is about 90.6389915773.

Subtracting 744638 from its reverse (836447), we obtain a square (91809 = 303²).

The spelling of 744638 in words is "seven hundred forty-four thousand, six hundred thirty-eight".