521480 has 16 divisors (see below), whose sum is σ = 1173420. Its totient is φ = 208576.

The previous prime is 521471. The next prime is 521483. The reversal of 521480 is 84125.

521480 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 521284 + 196 = 722^2 + 14^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is not an unprimeable number, because it can be changed into a prime (521483) by changing a digit.

521480 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, 6479 + ... + 6558.

2⁵²¹⁴⁸⁰ is an apocalyptic number.

It is an amenable number.

521480 is an abundant number, since it is smaller than the sum of its proper divisors (651940).

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

521480 is a wasteful number, since it uses less digits than its factorization.

521480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13048 (or 13044 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 20.

The square root of 521480 is about 722.1357213156. The cubic root of 521480 is about 80.4907336015.

It can be divided in two parts, 521 and 480, that added together give a palindrome (1001).

The spelling of 521480 in words is "five hundred twenty-one thousand, four hundred eighty".