521974908 has 192 divisors, whose sum is σ = 1680645120. Its totient is φ = 136422144.

The previous prime is 521974877. The next prime is 521974909. The reversal of 521974908 is 809479125.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521974909) 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 63 ways as a sum of consecutive naturals, for example, 1700091 + ... + 1700397.

It is an arithmetic number, because the mean of its divisors is an integer number (8753360).

Almost surely, 2^521974908 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 521974908, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (840322560).

521974908 is an abundant number, since it is smaller than the sum of its proper divisors (1158670212).

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

521974908 is a wasteful number, since it uses less digits than its factorization.

521974908 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 513 (or 505 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 45.

The square root of 521974908 is about 22846.7701874904. The cubic root of 521974908 is about 805.1618866068.

The spelling of 521974908 in words is "five hundred twenty-one million, nine hundred seventy-four thousand, nine hundred eight".