744639 has 16 divisors (see below), whose sum is σ = 1155840. Its totient is φ = 417600.

The previous prime is 744637. The next prime is 744641. The reversal of 744639 is 936447.

It is an interprime number because it is at equal distance from previous prime (744637) and next prime (744641).

It is not a de Polignac number, because 744639 - 2¹ = 744637 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (744637) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 939 + ... + 1539.

It is an arithmetic number, because the mean of its divisors is an integer number (72240).

2⁷⁴⁴⁶³⁹ is an apocalyptic number.

744639 is a deficient number, since it is larger than the sum of its proper divisors (411201).

744639 is a wasteful number, since it uses less digits than its factorization.

744639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 670.

The product of its digits is 18144, while the sum is 33.

The square root of 744639 is about 862.9246780571. The cubic root of 744639 is about 90.6390321514.

The spelling of 744639 in words is "seven hundred forty-four thousand, six hundred thirty-nine".