521122380 has 24 divisors (see below), whose sum is σ = 1459142832. Its totient is φ = 138965952.

The previous prime is 521122379. The next prime is 521122387. The reversal of 521122380 is 83221125.

It is a self number, because there is not a number n which added to its sum of digits gives 521122380.

It is not an unprimeable number, because it can be changed into a prime (521122387) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4342627 + ... + 4342746.

It is an arithmetic number, because the mean of its divisors is an integer number (60797618).

Almost surely, 2^521122380 is an apocalyptic number.

It is an amenable number.

521122380 is an abundant number, since it is smaller than the sum of its proper divisors (938020452).

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

521122380 is a wasteful number, since it uses less digits than its factorization.

521122380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8685385 (or 8685383 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 24.

The square root of 521122380 is about 22828.1050461925. The cubic root of 521122380 is about 804.7232977734.

The spelling of 521122380 in words is "five hundred twenty-one million, one hundred twenty-two thousand, three hundred eighty".