521868 has 24 divisors (see below), whose sum is σ = 1229872. Its totient is φ = 172224.

The previous prime is 521861. The next prime is 521869. The reversal of 521868 is 868125.

It is not an unprimeable number, because it can be changed into a prime (521861) by changing a digit.

521868 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 7 ways as a sum of consecutive naturals, for example, 1746 + ... + 2022.

2⁵²¹⁸⁶⁸ is an apocalyptic number.

It is an amenable number.

521868 is an abundant number, since it is smaller than the sum of its proper divisors (708004).

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

521868 is a wasteful number, since it uses less digits than its factorization.

521868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 441 (or 439 counting only the distinct ones).

The product of its digits is 3840, while the sum is 30.

The square root of 521868 is about 722.4043189240. The cubic root of 521868 is about 80.5106913259.

The spelling of 521868 in words is "five hundred twenty-one thousand, eight hundred sixty-eight".