505090 has 16 divisors (see below), whose sum is σ = 927288. Its totient is φ = 198016.

The previous prime is 505073. The next prime is 505091. The reversal of 505090 is 90505.

It can be written as a sum of positive squares in 4 ways, for example, as 431649 + 73441 = 657^2 + 271^2 .

It is an Ulam number.

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

It is not an unprimeable number, because it can be changed into a prime (505091) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 54 + ... + 1006.

2⁵⁰⁵⁰⁹⁰ is an apocalyptic number.

505090 is a deficient number, since it is larger than the sum of its proper divisors (422198).

505090 is a wasteful number, since it uses less digits than its factorization.

505090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1013.

The product of its (nonzero) digits is 225, while the sum is 19.

The square root of 505090 is about 710.6968411355. The cubic root of 505090 is about 79.6384728543.

Adding to 505090 its reverse (90505), we get a palindrome (595595).

The spelling of 505090 in words is "five hundred five thousand, ninety".