505290 has 16 divisors (see below), whose sum is σ = 1212768. Its totient is φ = 134736.

The previous prime is 505283. The next prime is 505301. The reversal of 505290 is 92505.

It is an alternating number because its digits alternate between odd and even.

It is an unprimeable number.

505290 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 7 ways as a sum of consecutive naturals, for example, 8392 + ... + 8451.

It is an arithmetic number, because the mean of its divisors is an integer number (75798).

2⁵⁰⁵²⁹⁰ is an apocalyptic number.

505290 is an abundant number, since it is smaller than the sum of its proper divisors (707478).

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

505290 is a wasteful number, since it uses less digits than its factorization.

505290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16853.

The product of its (nonzero) digits is 450, while the sum is 21.

The square root of 505290 is about 710.8375341806. The cubic root of 505290 is about 79.6489829236.

Adding to 505290 its reverse (92505), we get a palindrome (597795).

The spelling of 505290 in words is "five hundred five thousand, two hundred ninety".