275805 has 24 divisors (see below), whose sum is σ = 497952. Its totient is φ = 146448.

The previous prime is 275783. The next prime is 275813. The reversal of 275805 is 508572.

It is a happy number.

It is not a de Polignac number, because 275805 - 2⁵ = 275773 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

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 275805.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1102 + ... + 1328.

It is an arithmetic number, because the mean of its divisors is an integer number (20748).

2²⁷⁵⁸⁰⁵ is an apocalyptic number.

It is an amenable number.

275805 is a deficient number, since it is larger than the sum of its proper divisors (222147).

275805 is an equidigital number, since it uses as much as digits as its factorization.

275805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 247 (or 235 counting only the distinct ones).

The product of its (nonzero) digits is 2800, while the sum is 27.

The square root of 275805 is about 525.1714005922. The cubic root of 275805 is about 65.0929636261.

It can be divided in two parts, 27 and 5805, that added together give a cube (5832 = 18³).

The spelling of 275805 in words is "two hundred seventy-five thousand, eight hundred five".