521411840 has 144 divisors (see below), whose sum is σ = 1324512000. Its totient is φ = 196263936.

The previous prime is 521411831. The next prime is 521411857. The reversal of 521411840 is 48114125.

It is a congruent number.

It is an unprimeable number.

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, 2620061 + ... + 2620259.

It is an arithmetic number, because the mean of its divisors is an integer number (9198000).

Almost surely, 2^521411840 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 521411840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (662256000).

521411840 is an abundant number, since it is smaller than the sum of its proper divisors (803100160).

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

521411840 is a wasteful number, since it uses less digits than its factorization.

521411840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 332 (or 318 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 26.

The square root of 521411840 is about 22834.4441578945. Note that the first 3 decimals coincide. The cubic root of 521411840 is about 804.8722660386.

Adding to 521411840 its reverse (48114125), we get a palindrome (569525965).

The spelling of 521411840 in words is "five hundred twenty-one million, four hundred eleven thousand, eight hundred forty".