27129 has 4 divisors (see below), whose sum is σ = 36176. Its totient is φ = 18084.

The previous prime is 27127. The next prime is 27143. The reversal of 27129 is 92172.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 27129 - 2¹ = 27127 is a prime.

It is a d-powerful number, because it can be written as 2¹¹ + 7⁵ + 1 + 2¹³ + 9² .

It is a D-number.

It is a Duffinian 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, 4519 + ... + 4524.

It is an arithmetic number, because the mean of its divisors is an integer number (9044).

2²⁷¹²⁹ is an apocalyptic number.

It is an amenable number.

27129 is a deficient number, since it is larger than the sum of its proper divisors (9047).

27129 is an equidigital number, since it uses as much as digits as its factorization.

27129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9046.

The product of its digits is 252, while the sum is 21.

The square root of 27129 is about 164.7088340072. The cubic root of 27129 is about 30.0477018886.

It can be divided in two parts, 271 and 29, that added together give a triangular number (300 = T₂₄).

The spelling of 27129 in words is "twenty-seven thousand, one hundred twenty-nine".