521438540 has 48 divisors (see below), whose sum is σ = 1265544000. Its totient is φ = 176765952.

The previous prime is 521438509. The next prime is 521438549. The reversal of 521438540 is 45834125.

It is a junction number, because it is equal to n+sod(n) for n = 521438497 and 521438506.

It is not an unprimeable number, because it can be changed into a prime (521438549) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 8465 + ... + 33384.

It is an arithmetic number, because the mean of its divisors is an integer number (26365500).

Almost surely, 2^521438540 is an apocalyptic number.

It is an amenable number.

521438540 is an abundant number, since it is smaller than the sum of its proper divisors (744105460).

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

521438540 is a wasteful number, since it uses less digits than its factorization.

521438540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41954 (or 41952 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 32.

The square root of 521438540 is about 22835.0287935006. The cubic root of 521438540 is about 804.8860042017.

The spelling of 521438540 in words is "five hundred twenty-one million, four hundred thirty-eight thousand, five hundred forty".