520403 has 4 divisors (see below), whose sum is σ = 560448. Its totient is φ = 480360.

The previous prime is 520393. The next prime is 520409. The reversal of 520403 is 304025.

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

It is a cyclic number.

It is not a de Polignac number, because 520403 - 2⁶ = 520339 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (520409) 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, 20003 + ... + 20028.

It is an arithmetic number, because the mean of its divisors is an integer number (140112).

2⁵²⁰⁴⁰³ is an apocalyptic number.

520403 is a deficient number, since it is larger than the sum of its proper divisors (40045).

520403 is a wasteful number, since it uses less digits than its factorization.

520403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40044.

The product of its (nonzero) digits is 120, while the sum is 14.

The square root of 520403 is about 721.3896311980. The cubic root of 520403 is about 80.4352835573.

Adding to 520403 its reverse (304025), we get a palindrome (824428).

The spelling of 520403 in words is "five hundred twenty thousand, four hundred three".