521802 has 20 divisors (see below), whose sum is σ = 1169586. Its totient is φ = 173880.

The previous prime is 521791. The next prime is 521809. The reversal of 521802 is 208125.

521802 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 385641 + 136161 = 621^2 + 369^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 521802.

It is not an unprimeable number, because it can be changed into a prime (521809) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 1449 + ... + 1772.

2⁵²¹⁸⁰² is an apocalyptic number.

521802 is an abundant number, since it is smaller than the sum of its proper divisors (647784).

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

521802 is a wasteful number, since it uses less digits than its factorization.

521802 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3235 (or 3226 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 18.

The square root of 521802 is about 722.3586366896. The cubic root of 521802 is about 80.5072971537.

Adding to 521802 its reverse (208125), we get a palindrome (729927).

The spelling of 521802 in words is "five hundred twenty-one thousand, eight hundred two".