521140 has 24 divisors (see below), whose sum is σ = 1112832. Its totient is φ = 204960.

The previous prime is 521137. The next prime is 521153. The reversal of 521140 is 41125.

It is a self number, because there is not a number n which added to its sum of digits gives 521140.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1237 + ... + 1603.

It is an arithmetic number, because the mean of its divisors is an integer number (46368).

2⁵²¹¹⁴⁰ is an apocalyptic number.

It is an amenable number.

521140 is an abundant number, since it is smaller than the sum of its proper divisors (591692).

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

521140 is a wasteful number, since it uses less digits than its factorization.

521140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 447 (or 445 counting only the distinct ones).

The product of its (nonzero) digits is 40, while the sum is 13.

The square root of 521140 is about 721.9002701205. The cubic root of 521140 is about 80.4732367341.

Adding to 521140 its reverse (41125), we get a palindrome (562265).

The spelling of 521140 in words is "five hundred twenty-one thousand, one hundred forty".