521436 has 24 divisors (see below), whose sum is σ = 1281280. Its totient is φ = 164592.

The previous prime is 521429. The next prime is 521447. The reversal of 521436 is 634125.

It is a happy number.

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

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 521436.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 916 + ... + 1371.

2⁵²¹⁴³⁶ is an apocalyptic number.

It is an amenable number.

521436 is an abundant number, since it is smaller than the sum of its proper divisors (759844).

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

521436 is a wasteful number, since it uses less digits than its factorization.

521436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2313 (or 2311 counting only the distinct ones).

The product of its digits is 720, while the sum is 21.

The square root of 521436 is about 722.1052554857. The cubic root of 521436 is about 80.4884697296.

The spelling of 521436 in words is "five hundred twenty-one thousand, four hundred thirty-six".