523540 has 12 divisors (see below), whose sum is σ = 1099476. Its totient is φ = 209408.

The previous prime is 523519. The next prime is 523541. The reversal of 523540 is 45325.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 374544 + 148996 = 612^2 + 386^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (523541) by changing a digit.

523540 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 3 ways as a sum of consecutive naturals, for example, 13069 + ... + 13108.

It is an arithmetic number, because the mean of its divisors is an integer number (91623).

2⁵²³⁵⁴⁰ is an apocalyptic number.

It is an amenable number.

523540 is an abundant number, since it is smaller than the sum of its proper divisors (575936).

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

523540 is a wasteful number, since it uses less digits than its factorization.

523540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26186 (or 26184 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 19.

The square root of 523540 is about 723.5606401678. The cubic root of 523540 is about 80.5965817358.

Adding to 523540 its reverse (45325), we get a palindrome (568865).

The spelling of 523540 in words is "five hundred twenty-three thousand, five hundred forty".