744509 has 4 divisors (see below), whose sum is σ = 746460. Its totient is φ = 742560.

The previous prime is 744503. The next prime is 744511. The reversal of 744509 is 905447.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 905447 = 83 ⋅10909.

It can be written as a sum of positive squares in 2 ways, for example, as 120409 + 624100 = 347^2 + 790^2 .

It is a cyclic number.

It is not a de Polignac number, because 744509 - 2⁴ = 744493 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (744503) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 194 + ... + 1235.

It is an arithmetic number, because the mean of its divisors is an integer number (186615).

2⁷⁴⁴⁵⁰⁹ is an apocalyptic number.

It is an amenable number.

744509 is a deficient number, since it is larger than the sum of its proper divisors (1951).

744509 is a wasteful number, since it uses less digits than its factorization.

744509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1950.

The product of its (nonzero) digits is 5040, while the sum is 29.

The square root of 744509 is about 862.8493495391. The cubic root of 744509 is about 90.6337572195.

The spelling of 744509 in words is "seven hundred forty-four thousand, five hundred nine".