521380440 has 96 divisors (see below), whose sum is σ = 1936565280. Its totient is φ = 119172096.

The previous prime is 521380427. The next prime is 521380441. The reversal of 521380440 is 44083125.

521380440 is a `hidden beast` number, since 5 + 213 + 8 + 0 + 440 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521380441) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 100929 + ... + 105968.

It is an arithmetic number, because the mean of its divisors is an integer number (20172555).

Almost surely, 2^521380440 is an apocalyptic number.

It is an amenable number.

521380440 is an abundant number, since it is smaller than the sum of its proper divisors (1415184840).

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

521380440 is a wasteful number, since it uses less digits than its factorization.

521380440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 206921 (or 206914 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

The square root of 521380440 is about 22833.7565897511. The cubic root of 521380440 is about 804.8561089471.

The spelling of 521380440 in words is "five hundred twenty-one million, three hundred eighty thousand, four hundred forty".