520398420 has 48 divisors (see below), whose sum is σ = 1458296448. Its totient is φ = 138660480.

The previous prime is 520398413. The next prime is 520398421. The reversal of 520398420 is 24893025.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (520398421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 93105 + ... + 98535.

It is an arithmetic number, because the mean of its divisors is an integer number (30381176).

Almost surely, 2^520398420 is an apocalyptic number.

It is an amenable number.

520398420 is an abundant number, since it is smaller than the sum of its proper divisors (937898028).

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

520398420 is a wasteful number, since it uses less digits than its factorization.

520398420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7040 (or 7038 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 33.

The square root of 520398420 is about 22812.2427656730. The cubic root of 520398420 is about 804.3504758973.

The spelling of 520398420 in words is "five hundred twenty million, three hundred ninety-eight thousand, four hundred twenty".