522440 has 32 divisors (see below), whose sum is σ = 1210680. Its totient is φ = 202752.

The previous prime is 522439. The next prime is 522449. The reversal of 522440 is 44225.

522440 is nontrivially palindromic in base 9.

It can be written as a sum of positive squares in 4 ways, for example, as 481636 + 40804 = 694^2 + 202^2 .

It is not an unprimeable number, because it can be changed into a prime (522449) 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, 1304 + ... + 1656.

2⁵²²⁴⁴⁰ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 522440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (605340).

522440 is an abundant number, since it is smaller than the sum of its proper divisors (688240).

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

522440 is a wasteful number, since it uses less digits than its factorization.

522440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 401 (or 397 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 17.

The square root of 522440 is about 722.8001106807. The cubic root of 522440 is about 80.5400955050.

Adding to 522440 its reverse (44225), we get a palindrome (566665).

The spelling of 522440 in words is "five hundred twenty-two thousand, four hundred forty".