503813 has 4 divisors (see below), whose sum is σ = 507180. Its totient is φ = 500448.

The previous prime is 503803. The next prime is 503819. The reversal of 503813 is 318305.

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 214369 + 289444 = 463^2 + 538^2 .

It is a cyclic number.

It is not a de Polignac number, because 503813 - 2¹² = 499717 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (503819) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1448 + ... + 1761.

It is an arithmetic number, because the mean of its divisors is an integer number (126795).

2⁵⁰³⁸¹³ is an apocalyptic number.

It is an amenable number.

503813 is a deficient number, since it is larger than the sum of its proper divisors (3367).

503813 is a wasteful number, since it uses less digits than its factorization.

503813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3366.

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 503813 is about 709.7978585485. The cubic root of 503813 is about 79.5713005634.

The spelling of 503813 in words is "five hundred three thousand, eight hundred thirteen".