27391 has 12 divisors (see below), whose sum is σ = 35112. Its totient is φ = 21168.

The previous prime is 27367. The next prime is 27397. The reversal of 27391 is 19372.

27391 is nontrivially palindromic in base 9.

It is not a de Polignac number, because 27391 - 2⁹ = 26879 is a prime.

It is the 166-th Hogben number.

Its product of digits (378) is a multiple of the sum of its prime divisors (63).

It is a plaindrome in base 4 and base 16.

It is a nialpdrome in base 13.

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 nontrivial repunit in base 165.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 616 + ... + 658.

It is an arithmetic number, because the mean of its divisors is an integer number (2926).

2²⁷³⁹¹ is an apocalyptic number.

27391 is a deficient number, since it is larger than the sum of its proper divisors (7721).

27391 is a wasteful number, since it uses less digits than its factorization.

27391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70 (or 63 counting only the distinct ones).

The product of its digits is 378, while the sum is 22.

The square root of 27391 is about 165.5022658455. The cubic root of 27391 is about 30.1441213407.

The spelling of 27391 in words is "twenty-seven thousand, three hundred ninety-one".