520921206 has 120 divisors (see below), whose sum is σ = 1291379760. Its totient is φ = 156821184.

The previous prime is 520921201. The next prime is 520921253. The reversal of 520921206 is 602129025.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 520921206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (520921201) by changing a digit.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 1450855 + ... + 1451213.

It is an arithmetic number, because the mean of its divisors is an integer number (10761498).

Almost surely, 2^520921206 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 520921206, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (645689880).

520921206 is an abundant number, since it is smaller than the sum of its proper divisors (770458554).

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

520921206 is a wasteful number, since it uses less digits than its factorization.

520921206 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 452 (or 430 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 520921206 is about 22823.6983418551. The cubic root of 520921206 is about 804.6197326946.

The spelling of 520921206 in words is "five hundred twenty million, nine hundred twenty-one thousand, two hundred six".