505242 has 12 divisors (see below), whose sum is σ = 1094730. Its totient is φ = 168408.

The previous prime is 505237. The next prime is 505277. The reversal of 505242 is 242505.

It can be written as a sum of positive squares in only one way, i.e., 488601 + 16641 = 699^2 + 129^2 .

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: 28069 = 505242 / (5 + 0 + 5 + 2 + 4 + 2).

It is an unprimeable number.

505242 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 14017 + ... + 14052.

2⁵⁰⁵²⁴² is an apocalyptic number.

505242 is an abundant number, since it is smaller than the sum of its proper divisors (589488).

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

505242 is a wasteful number, since it uses less digits than its factorization.

505242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28077 (or 28074 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 18.

The square root of 505242 is about 710.8037703895. The cubic root of 505242 is about 79.6464607599.

Adding to 505242 its reverse (242505), we get a palindrome (747747).

It can be divided in two parts, 505 and 242, that added together give a palindrome (747).

The spelling of 505242 in words is "five hundred five thousand, two hundred forty-two".