521303040 has 264 divisors, whose sum is σ = 1877672160. Its totient is φ = 138682368.

The previous prime is 521303023. The next prime is 521303059. The reversal of 521303040 is 40303125.

It is a Harshad number since it is a multiple of its sum of digits (18).

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 23 ways as a sum of consecutive naturals, for example, 1243951 + ... + 1244369.

Almost surely, 2^521303040 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 521303040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (938836080).

521303040 is an abundant number, since it is smaller than the sum of its proper divisors (1356369120).

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

521303040 is an equidigital number, since it uses as much as digits as its factorization.

521303040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 459 (or 429 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 18.

The square root of 521303040 is about 22832.0616677513. The cubic root of 521303040 is about 804.8162794605.

Adding to 521303040 its reverse (40303125), we get a palindrome (561606165).

The spelling of 521303040 in words is "five hundred twenty-one million, three hundred three thousand, forty".