581240 has 32 divisors (see below), whose sum is σ = 1427760. Its totient is φ = 211200.

The previous prime is 581239. The next prime is 581261. The reversal of 581240 is 42185.

It is a Smith number, since the sum of its digits (20) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 221 + ... + 1100.

2⁵⁸¹²⁴⁰ is an apocalyptic number.

It is an amenable number.

581240 is an abundant number, since it is smaller than the sum of its proper divisors (846520).

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

581240 is a wasteful number, since it uses less digits than its factorization.

581240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1343 (or 1339 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 20.

The square root of 581240 is about 762.3909758123. The cubic root of 581240 is about 83.4548981333.

The spelling of 581240 in words is "five hundred eighty-one thousand, two hundred forty".