27123 has 4 divisors (see below), whose sum is σ = 36168. Its totient is φ = 18080.

The previous prime is 27109. The next prime is 27127. The reversal of 27123 is 32172.

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

It is a cyclic number.

It is not a de Polignac number, because 27123 - 2⁴ = 27107 is a prime.

It is a D-number.

It is not an unprimeable number, because it can be changed into a prime (27127) 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, 4518 + ... + 4523.

It is an arithmetic number, because the mean of its divisors is an integer number (9042).

2²⁷¹²³ is an apocalyptic number.

27123 is a deficient number, since it is larger than the sum of its proper divisors (9045).

27123 is an equidigital number, since it uses as much as digits as its factorization.

27123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9044.

The product of its digits is 84, while the sum is 15.

The square root of 27123 is about 164.6906190407. The cubic root of 27123 is about 30.0454865531.

Adding to 27123 its reverse (32172), we get a palindrome (59295).

It can be divided in two parts, 27 and 123, that multiplied together give a triangular number (3321 = T₈₁).

The spelling of 27123 in words is "twenty-seven thousand, one hundred twenty-three", and thus it is an iban number.