27399 has 4 divisors (see below), whose sum is σ = 36536. Its totient is φ = 18264.

The previous prime is 27397. The next prime is 27407. The reversal of 27399 is 99372.

27399 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 27399 - 2¹ = 27397 is a prime.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27397) 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, 4564 + ... + 4569.

It is an arithmetic number, because the mean of its divisors is an integer number (9134).

2²⁷³⁹⁹ is an apocalyptic number.

27399 is a deficient number, since it is larger than the sum of its proper divisors (9137).

27399 is an equidigital number, since it uses as much as digits as its factorization.

27399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9136.

The product of its digits is 3402, while the sum is 30.

The square root of 27399 is about 165.5264329344. The cubic root of 27399 is about 30.1470557535.

The spelling of 27399 in words is "twenty-seven thousand, three hundred ninety-nine".