522405 has 48 divisors (see below), whose sum is σ = 1048320. Its totient is φ = 238464.

The previous prime is 522391. The next prime is 522409. The reversal of 522405 is 504225.

It is not a de Polignac number, because 522405 - 2⁵ = 522373 is a prime.

Together with 525915 it forms an amicable pair .

It is a Curzon number.

522405 is a lucky number.

It is a nialpdrome in base 9.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (522409) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 11092 + ... + 11138.

It is an arithmetic number, because the mean of its divisors is an integer number (21840).

2⁵²²⁴⁰⁵ is an apocalyptic number.

It is an amenable number.

522405 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

522405 is a wasteful number, since it uses less digits than its factorization.

522405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90 (or 87 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 18.

The square root of 522405 is about 722.7758988788. The cubic root of 522405 is about 80.5382969148.

The spelling of 522405 in words is "five hundred twenty-two thousand, four hundred five".