505690 has 16 divisors (see below), whose sum is σ = 926280. Its totient is φ = 198720.

The previous prime is 505669. The next prime is 505691. The reversal of 505690 is 96505.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 281961 + 223729 = 531^2 + 473^2 .

It is a super-2 number, since 2×505690² = 511444752200, which contains 22 as substring.

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 (505691) by changing a digit.

505690 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 7 ways as a sum of consecutive naturals, for example, 196 + ... + 1024.

2⁵⁰⁵⁶⁹⁰ is an apocalyptic number.

505690 is a deficient number, since it is larger than the sum of its proper divisors (420590).

505690 is a wasteful number, since it uses less digits than its factorization.

505690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 897.

The product of its (nonzero) digits is 1350, while the sum is 25.

The square root of 505690 is about 711.1188367636. The cubic root of 505690 is about 79.6699947451.

The spelling of 505690 in words is "five hundred five thousand, six hundred ninety".