521836 has 12 divisors (see below), whose sum is σ = 1043728. Its totient is φ = 223632.

The previous prime is 521831. The next prime is 521861. The reversal of 521836 is 638125.

It is a happy number.

521836 is an admirable number.

It is an alternating number because its digits alternate between odd and even.

It is a self number, because there is not a number n which added to its sum of digits gives 521836.

It is not an unprimeable number, because it can be changed into a prime (521831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9291 + ... + 9346.

2⁵²¹⁸³⁶ is an apocalyptic number.

It is an amenable number.

521836 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

521836 is a wasteful number, since it uses less digits than its factorization.

521836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18648 (or 18646 counting only the distinct ones).

The product of its digits is 1440, while the sum is 25.

The square root of 521836 is about 722.3821703226. The cubic root of 521836 is about 80.5090457024.

The spelling of 521836 in words is "five hundred twenty-one thousand, eight hundred thirty-six".