521434540 has 96 divisors (see below), whose sum is σ = 1277627904. Its totient is φ = 176655360.

The previous prime is 521434519. The next prime is 521434549. The reversal of 521434540 is 45434125.

It is a junction number, because it is equal to n+sod(n) for n = 521434499 and 521434508.

It is not an unprimeable number, because it can be changed into a prime (521434549) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 399529 + ... + 400831.

It is an arithmetic number, because the mean of its divisors is an integer number (13308624).

Almost surely, 2^521434540 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 521434540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (638813952).

521434540 is an abundant number, since it is smaller than the sum of its proper divisors (756193364).

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

521434540 is a wasteful number, since it uses less digits than its factorization.

521434540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1447 (or 1445 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 28.

The square root of 521434540 is about 22834.9412085952. The cubic root of 521434540 is about 804.8839460798.

Adding to 521434540 its reverse (45434125), we get a palindrome (566868665).

The spelling of 521434540 in words is "five hundred twenty-one million, four hundred thirty-four thousand, five hundred forty".