504809 has 4 divisors (see below), whose sum is σ = 507780. Its totient is φ = 501840.

The previous prime is 504799. The next prime is 504817. The reversal of 504809 is 908405.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 120409 + 384400 = 347^2 + 620^2 .

It is a cyclic number.

It is not a de Polignac number, because 504809 - 2¹² = 500713 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 504809.

It is not an unprimeable number, because it can be changed into a prime (504209) 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, 1214 + ... + 1575.

It is an arithmetic number, because the mean of its divisors is an integer number (126945).

2⁵⁰⁴⁸⁰⁹ is an apocalyptic number.

It is an amenable number.

504809 is a deficient number, since it is larger than the sum of its proper divisors (2971).

504809 is a wasteful number, since it uses less digits than its factorization.

504809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2970.

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 504809 is about 710.4991203372. The cubic root of 504809 is about 79.6237015184.

The spelling of 504809 in words is "five hundred four thousand, eight hundred nine".