521040 has 80 divisors (see below), whose sum is σ = 1749888. Its totient is φ = 127488.

The previous prime is 521039. The next prime is 521041. The reversal of 521040 is 40125.

It is an interprime number because it is at equal distance from previous prime (521039) and next prime (521041).

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521041) 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 15 ways as a sum of consecutive naturals, for example, 3037 + ... + 3203.

2⁵²¹⁰⁴⁰ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 521040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (874944).

521040 is an abundant number, since it is smaller than the sum of its proper divisors (1228848).

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

521040 is a wasteful number, since it uses less digits than its factorization.

521040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 196 (or 190 counting only the distinct ones).

The product of its (nonzero) digits is 40, while the sum is 12.

The square root of 521040 is about 721.8310051529. The cubic root of 521040 is about 80.4680891484.

Adding to 521040 its reverse (40125), we get a palindrome (561165).

The spelling of 521040 in words is "five hundred twenty-one thousand, forty".