581440 has 56 divisors (see below), whose sum is σ = 1463040. Its totient is φ = 219648.

The previous prime is 581429. The next prime is 581443. The reversal of 581440 is 44185.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (581443) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7321 + ... + 7399.

2⁵⁸¹⁴⁴⁰ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 581440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (731520).

581440 is an abundant number, since it is smaller than the sum of its proper divisors (881600).

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

581440 is a wasteful number, since it uses less digits than its factorization.

581440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119 (or 109 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 22.

The square root of 581440 is about 762.5221308264. The cubic root of 581440 is about 83.4644690883.

The spelling of 581440 in words is "five hundred eighty-one thousand, four hundred forty".