581420 has 24 divisors (see below), whose sum is σ = 1395744. Its totient is φ = 199296.

The previous prime is 581411. The next prime is 581429. The reversal of 581420 is 24185.

It is an interprime number because it is at equal distance from previous prime (581411) and next prime (581429).

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

It is a junction number, because it is equal to n+sod(n) for n = 581392 and 581401.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 581420.

It is not an unprimeable number, because it can be changed into a prime (581429) by changing a digit.

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, 1937 + ... + 2216.

It is an arithmetic number, because the mean of its divisors is an integer number (58156).

2⁵⁸¹⁴²⁰ is an apocalyptic number.

It is an amenable number.

581420 is an abundant number, since it is smaller than the sum of its proper divisors (814324).

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

581420 is a wasteful number, since it uses less digits than its factorization.

581420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4169 (or 4167 counting only the distinct ones).

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

The square root of 581420 is about 762.5090163401. The cubic root of 581420 is about 83.4635120916.

It can be divided in two parts, 581 and 420, that added together give a palindrome (1001).

The spelling of 581420 in words is "five hundred eighty-one thousand, four hundred twenty".