521980 has 12 divisors (see below), whose sum is σ = 1096200. Its totient is φ = 208784.

The previous prime is 521929. The next prime is 521981. The reversal of 521980 is 89125.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521981) by changing a digit.

521980 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, 13030 + ... + 13069.

It is an arithmetic number, because the mean of its divisors is an integer number (91350).

2⁵²¹⁹⁸⁰ is an apocalyptic number.

It is an amenable number.

521980 is an abundant number, since it is smaller than the sum of its proper divisors (574220).

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

521980 is a wasteful number, since it uses less digits than its factorization.

521980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26108 (or 26106 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 25.

The square root of 521980 is about 722.4818336817. The cubic root of 521980 is about 80.5164504786.

The spelling of 521980 in words is "five hundred twenty-one thousand, nine hundred eighty".