503993 has 4 divisors (see below), whose sum is σ = 576000. Its totient is φ = 431988.

The previous prime is 503989. The next prime is 504001. The reversal of 503993 is 399305.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 399305 = 5 ⋅79861.

It is a cyclic number.

It is not a de Polignac number, because 503993 - 2² = 503989 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (503963) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35993 + ... + 36006.

It is an arithmetic number, because the mean of its divisors is an integer number (144000).

2⁵⁰³⁹⁹³ is an apocalyptic number.

It is an amenable number.

503993 is a deficient number, since it is larger than the sum of its proper divisors (72007).

503993 is an equidigital number, since it uses as much as digits as its factorization.

503993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72006.

The product of its (nonzero) digits is 3645, while the sum is 29.

The square root of 503993 is about 709.9246438883. The cubic root of 503993 is about 79.5807757250.

The spelling of 503993 in words is "five hundred three thousand, nine hundred ninety-three".