270905 has 4 divisors (see below), whose sum is σ = 325092. Its totient is φ = 216720.

The previous prime is 270899. The next prime is 270913. The reversal of 270905 is 509072.

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 32761 + 238144 = 181^2 + 488^2 .

It is not a de Polignac number, because 270905 - 2⁶ = 270841 is a prime.

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

It is a Duffinian 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, 27086 + ... + 27095.

It is an arithmetic number, because the mean of its divisors is an integer number (81273).

2²⁷⁰⁹⁰⁵ is an apocalyptic number.

It is an amenable number.

270905 is a deficient number, since it is larger than the sum of its proper divisors (54187).

270905 is an equidigital number, since it uses as much as digits as its factorization.

270905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54186.

The product of its (nonzero) digits is 630, while the sum is 23.

The square root of 270905 is about 520.4853504182. The cubic root of 270905 is about 64.7051736270.

Adding to 270905 its reverse (509072), we get a palindrome (779977).

It can be divided in two parts, 2 and 70905, that added together give a palindrome (70907).

The spelling of 270905 in words is "two hundred seventy thousand, nine hundred five".