521798 has 16 divisors (see below), whose sum is σ = 842400. Its totient is φ = 241536.

The previous prime is 521791. The next prime is 521809. The reversal of 521798 is 897125.

It is a Curzon number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 521798.

It is not an unprimeable number, because it can be changed into a prime (521791) by changing a digit.

521798 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3428 + ... + 3576.

It is an arithmetic number, because the mean of its divisors is an integer number (52650).

2⁵²¹⁷⁹⁸ is an apocalyptic number.

521798 is a deficient number, since it is larger than the sum of its proper divisors (320602).

521798 is a wasteful number, since it uses less digits than its factorization.

521798 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 271.

The product of its digits is 5040, while the sum is 32.

The square root of 521798 is about 722.3558679764. The cubic root of 521798 is about 80.5070914371.

The spelling of 521798 in words is "five hundred twenty-one thousand, seven hundred ninety-eight".