521852740 has 24 divisors (see below), whose sum is σ = 1160355672. Its totient is φ = 196462080.

The previous prime is 521852719. The next prime is 521852741. The reversal of 521852740 is 47258125.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 6471936 + 515380804 = 2544^2 + 22702^2 .

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a junction number, because it is equal to n+sod(n) for n = 521852696 and 521852705.

It is not an unprimeable number, because it can be changed into a prime (521852741) 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, 767091 + ... + 767770.

It is an arithmetic number, because the mean of its divisors is an integer number (48348153).

Almost surely, 2^521852740 is an apocalyptic number.

It is an amenable number.

521852740 is an abundant number, since it is smaller than the sum of its proper divisors (638502932).

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

521852740 is a wasteful number, since it uses less digits than its factorization.

521852740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1534887 (or 1534885 counting only the distinct ones).

The product of its (nonzero) digits is 22400, while the sum is 34.

The square root of 521852740 is about 22844.0963927226. The cubic root of 521852740 is about 805.0990657758.

The spelling of 521852740 in words is "five hundred twenty-one million, eight hundred fifty-two thousand, seven hundred forty".