521525040 has 80 divisors (see below), whose sum is σ = 1618944000. Its totient is φ = 138882816.

The previous prime is 521525029. The next prime is 521525047. The reversal of 521525040 is 40525125.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 521525040.

It is not an unprimeable number, because it can be changed into a prime (521525047) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 306111 + ... + 307809.

It is an arithmetic number, because the mean of its divisors is an integer number (20236800).

Almost surely, 2^521525040 is an apocalyptic number.

It is an amenable number.

521525040 is an abundant number, since it is smaller than the sum of its proper divisors (1097418960).

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

521525040 is a wasteful number, since it uses less digits than its factorization.

521525040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2994 (or 2988 counting only the distinct ones).

The product of its (nonzero) digits is 2000, while the sum is 24.

The square root of 521525040 is about 22836.9227349045. The cubic root of 521525040 is about 804.9305085134.

The spelling of 521525040 in words is "five hundred twenty-one million, five hundred twenty-five thousand, forty".