522640 has 40 divisors (see below), whose sum is σ = 1249920. Its totient is φ = 203136.

The previous prime is 522637. The next prime is 522659. The reversal of 522640 is 46225.

It is a tau number, because it is divible by the number of its divisors (40).

It is an unprimeable number.

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, 3691 + ... + 3829.

It is an arithmetic number, because the mean of its divisors is an integer number (31248).

2⁵²²⁶⁴⁰ 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 522640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (624960).

522640 is an abundant number, since it is smaller than the sum of its proper divisors (727280).

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

522640 is a wasteful number, since it uses less digits than its factorization.

522640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199 (or 193 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 522640 is about 722.9384482790. The cubic root of 522640 is about 80.5503716222.

Adding to 522640 its reverse (46225), we get a palindrome (568865).

The spelling of 522640 in words is "five hundred twenty-two thousand, six hundred forty".