505406 has 8 divisors (see below), whose sum is σ = 827064. Its totient is φ = 229720.

The previous prime is 505399. The next prime is 505409. The reversal of 505406 is 604505.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (505409) by changing a digit.

505406 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 3 ways as a sum of consecutive naturals, for example, 11465 + ... + 11508.

It is an arithmetic number, because the mean of its divisors is an integer number (103383).

2⁵⁰⁵⁴⁰⁶ is an apocalyptic number.

505406 is a deficient number, since it is larger than the sum of its proper divisors (321658).

505406 is a wasteful number, since it uses less digits than its factorization.

505406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22986.

The product of its (nonzero) digits is 600, while the sum is 20.

The square root of 505406 is about 710.9191233889. The cubic root of 505406 is about 79.6550774931.

Subtracting 505406 from its reverse (604505), we obtain a palindrome (99099).

The spelling of 505406 in words is "five hundred five thousand, four hundred six".