521860 has 24 divisors (see below), whose sum is σ = 1111320. Its totient is φ = 205824.

The previous prime is 521831. The next prime is 521861. The reversal of 521860 is 68125.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 576 + 521284 = 24^2 + 722^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521861) 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, 1806 + ... + 2074.

It is an arithmetic number, because the mean of its divisors is an integer number (46305).

2⁵²¹⁸⁶⁰ is an apocalyptic number.

It is an amenable number.

521860 is an abundant number, since it is smaller than the sum of its proper divisors (589460).

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

521860 is a wasteful number, since it uses less digits than its factorization.

521860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 375 (or 373 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 521860 is about 722.3987818373. The cubic root of 521860 is about 80.5102799263.

Adding to 521860 its reverse (68125), we get a palindrome (589985).

The spelling of 521860 in words is "five hundred twenty-one thousand, eight hundred sixty".