568421 has 4 divisors (see below), whose sum is σ = 649632. Its totient is φ = 487212.

The previous prime is 568391. The next prime is 568433. The reversal of 568421 is 124865.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-568421 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (568441) 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, 40595 + ... + 40608.

It is an arithmetic number, because the mean of its divisors is an integer number (162408).

2⁵⁶⁸⁴²¹ is an apocalyptic number.

It is an amenable number.

568421 is a deficient number, since it is larger than the sum of its proper divisors (81211).

568421 is an equidigital number, since it uses as much as digits as its factorization.

568421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81210.

The product of its digits is 1920, while the sum is 26.

The square root of 568421 is about 753.9370000206. The cubic root of 568421 is about 82.8368110183.

Subtracting from 568421 its reverse (124865), we obtain a square (443556 = 666²).

It can be divided in two parts, 568 and 421, that added together give a palindrome (989).

The spelling of 568421 in words is "five hundred sixty-eight thousand, four hundred twenty-one".