290205 has 12 divisors (see below), whose sum is σ = 503100. Its totient is φ = 154752.

The previous prime is 290201. The next prime is 290209. The reversal of 290205 is 502092.

It is an interprime number because it is at equal distance from previous prime (290201) and next prime (290209).

It can be written as a sum of positive squares in 2 ways, for example, as 210681 + 79524 = 459^2 + 282^2 .

It is not a de Polignac number, because 290205 - 2² = 290201 is a prime.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 290205.

It is not an unprimeable number, because it can be changed into a prime (290201) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 3180 + ... + 3269.

It is an arithmetic number, because the mean of its divisors is an integer number (41925).

2²⁹⁰²⁰⁵ is an apocalyptic number.

It is an amenable number.

290205 is a deficient number, since it is larger than the sum of its proper divisors (212895).

290205 is a wasteful number, since it uses less digits than its factorization.

290205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6460 (or 6457 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 18.

The square root of 290205 is about 538.7067848097. The cubic root of 290205 is about 66.2066525505.

Adding to 290205 its reverse (502092), we get a palindrome (792297).

The spelling of 290205 in words is "two hundred ninety thousand, two hundred five".