744840 has 48 divisors (see below), whose sum is σ = 2421900. Its totient is φ = 198528.

The previous prime is 744833. The next prime is 744859. The reversal of 744840 is 48447.

744840 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 695556 + 49284 = 834^2 + 222^2 .

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a nialpdrome in base 15.

It is an unprimeable number.

744840 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 675 + ... + 1394.

2⁷⁴⁴⁸⁴⁰ is an apocalyptic number.

It is an amenable number.

744840 is an abundant number, since it is smaller than the sum of its proper divisors (1677060).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

744840 is a wasteful number, since it uses less digits than its factorization.

744840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2086 (or 2079 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 27.

The square root of 744840 is about 863.0411345932. The cubic root of 744840 is about 90.6471867993.

The spelling of 744840 in words is "seven hundred forty-four thousand, eight hundred forty".