390205 has 4 divisors (see below), whose sum is σ = 468252. Its totient is φ = 312160.

The previous prime is 390199. The next prime is 390209. The reversal of 390205 is 502093.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 88804 + 301401 = 298^2 + 549^2 .

It is not a de Polignac number, because 390205 - 2⁷ = 390077 is a prime.

It is a super-4 number, since 4×390205⁴ (a number of 23 digits) contains 4444 as substring.

It is a Duffinian number.

390205 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (390209) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39016 + ... + 39025.

It is an arithmetic number, because the mean of its divisors is an integer number (117063).

2³⁹⁰²⁰⁵ is an apocalyptic number.

It is an amenable number.

390205 is a deficient number, since it is larger than the sum of its proper divisors (78047).

390205 is an equidigital number, since it uses as much as digits as its factorization.

390205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78046.

The product of its (nonzero) digits is 270, while the sum is 19.

The square root of 390205 is about 624.6639096346. The cubic root of 390205 is about 73.0742348610.

Adding to 390205 its reverse (502093), we get a palindrome (892298).

It can be divided in two parts, 390 and 205, that added together give a palindrome (595).

The spelling of 390205 in words is "three hundred ninety thousand, two hundred five".