505840 has 20 divisors (see below), whose sum is σ = 1176264. Its totient is φ = 202304.

The previous prime is 505823. The next prime is 505867. The reversal of 505840 is 48505.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (20).

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

505840 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, 3082 + ... + 3241.

2⁵⁰⁵⁸⁴⁰ is an apocalyptic number.

It is an amenable number.

505840 is an abundant number, since it is smaller than the sum of its proper divisors (670424).

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

505840 is a wasteful number, since it uses less digits than its factorization.

505840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6336 (or 6330 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 22.

The square root of 505840 is about 711.2242965479. The cubic root of 505840 is about 79.6778713216.

The spelling of 505840 in words is "five hundred five thousand, eight hundred forty".