520971900 has 72 divisors (see below), whose sum is σ = 1529902080. Its totient is φ = 136847040.

The previous prime is 520971883. The next prime is 520971929. The reversal of 520971900 is 9179025.

It is a super-2 number, since 2×520971900² = 542823441179220000, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 7141 + ... + 33059.

It is an arithmetic number, because the mean of its divisors is an integer number (21248640).

Almost surely, 2^520971900 is an apocalyptic number.

520971900 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 520971900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (764951040).

520971900 is an abundant number, since it is smaller than the sum of its proper divisors (1008930180).

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

520971900 is a wasteful number, since it uses less digits than its factorization.

520971900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26003 (or 25996 counting only the distinct ones).

The product of its (nonzero) digits is 5670, while the sum is 33.

The square root of 520971900 is about 22824.8088710508. The cubic root of 520971900 is about 804.6458326557.

The spelling of 520971900 in words is "five hundred twenty million, nine hundred seventy-one thousand, nine hundred".