503406 has 12 divisors (see below), whose sum is σ = 1090752. Its totient is φ = 167796.

The previous prime is 503389. The next prime is 503407. The reversal of 503406 is 604305.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18), and also a Moran number because the ratio is a prime number: 27967 = 503406 / (5 + 0 + 3 + 4 + 0 + 6).

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 503406.

It is not an unprimeable number, because it can be changed into a prime (503407) by changing a digit.

503406 is an untouchable number, because it is not equal to the sum of proper divisors of any 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 5 ways as a sum of consecutive naturals, for example, 13966 + ... + 14001.

It is an arithmetic number, because the mean of its divisors is an integer number (90896).

2⁵⁰³⁴⁰⁶ is an apocalyptic number.

503406 is an abundant number, since it is smaller than the sum of its proper divisors (587346).

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

503406 is a wasteful number, since it uses less digits than its factorization.

503406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27975 (or 27972 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 18.

The square root of 503406 is about 709.5110992789. The cubic root of 503406 is about 79.5498678467.

It can be divided in two parts, 503 and 406, that added together give a palindrome (909).

The spelling of 503406 in words is "five hundred three thousand, four hundred six".