27205 has 4 divisors (see below), whose sum is σ = 32652. Its totient is φ = 21760.

The previous prime is 27197. The next prime is 27211. The reversal of 27205 is 50272.

It is a happy number.

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 14884 + 12321 = 122^2 + 111^2 .

It is not a de Polignac number, because 27205 - 2³ = 27197 is a prime.

It is a super-2 number, since 2×27205² = 1480224050, which contains 22 as substring.

It is a Duffinian number.

27205 is a lucky number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2716 + ... + 2725.

It is an arithmetic number, because the mean of its divisors is an integer number (8163).

2²⁷²⁰⁵ is an apocalyptic number.

It is an amenable number.

27205 is a deficient number, since it is larger than the sum of its proper divisors (5447).

27205 is an equidigital number, since it uses as much as digits as its factorization.

27205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5446.

The product of its (nonzero) digits is 140, while the sum is 16.

The square root of 27205 is about 164.9393828047. The cubic root of 27205 is about 30.0757345742.

Adding to 27205 its reverse (50272), we get a palindrome (77477).

It can be divided in two parts, 27 and 205, that added together give a palindrome (232).

The spelling of 27205 in words is "twenty-seven thousand, two hundred five".