521132440 has 32 divisors (see below), whose sum is σ = 1173210480. Its totient is φ = 208335232.

The previous prime is 521132401. The next prime is 521132441. The reversal of 521132440 is 44231125.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521132441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 116322 + ... + 120718.

Almost surely, 2^521132440 is an apocalyptic number.

It is an amenable number.

521132440 is an abundant number, since it is smaller than the sum of its proper divisors (652078040).

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

521132440 is a wasteful number, since it uses less digits than its factorization.

521132440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7371 (or 7367 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 521132440 is about 22828.3253875531. The cubic root of 521132440 is about 804.7284759968.

Adding to 521132440 its reverse (44231125), we get a palindrome (565363565).

The spelling of 521132440 in words is "five hundred twenty-one million, one hundred thirty-two thousand, four hundred forty".