505240 has 32 divisors (see below), whose sum is σ = 1205280. Its totient is φ = 189952.

The previous prime is 505237. The next prime is 505277. The reversal of 505240 is 42505.

It is a happy number.

505240 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 309 + ... + 1051.

It is an arithmetic number, because the mean of its divisors is an integer number (37665).

2⁵⁰⁵²⁴⁰ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 505240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (602640).

505240 is an abundant number, since it is smaller than the sum of its proper divisors (700040).

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

505240 is a wasteful number, since it uses less digits than its factorization.

505240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 771 (or 767 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 16.

The square root of 505240 is about 710.8023635301. The cubic root of 505240 is about 79.6463556663.

Adding to 505240 its reverse (42505), we get a palindrome (547745).

The spelling of 505240 in words is "five hundred five thousand, two hundred forty".