528421 has 4 divisors (see below), whose sum is σ = 539712. Its totient is φ = 517132.

The previous prime is 528419. The next prime is 528433. The reversal of 528421 is 124825.

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 not a de Polignac number, because 528421 - 2¹ = 528419 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a plaindrome in base 13.

It is a junction number, because it is equal to n+sod(n) for n = 528392 and 528401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (528401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5575 + ... + 5668.

It is an arithmetic number, because the mean of its divisors is an integer number (134928).

2⁵²⁸⁴²¹ is an apocalyptic number.

It is an amenable number.

528421 is a deficient number, since it is larger than the sum of its proper divisors (11291).

528421 is a wasteful number, since it uses less digits than its factorization.

528421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11290.

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

The square root of 528421 is about 726.9257183509. The cubic root of 528421 is about 80.8462765495.

It can be divided in two parts, 528 and 421, that added together give a palindrome (949).

The spelling of 528421 in words is "five hundred twenty-eight thousand, four hundred twenty-one".