27969 has 4 divisors (see below), whose sum is σ = 37296. Its totient is φ = 18644.

The previous prime is 27967. The next prime is 27983. The reversal of 27969 is 96972.

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 a cyclic number.

It is not a de Polignac number, because 27969 - 2¹ = 27967 is a prime.

It is a super-2 number, since 2×27969² = 1564529922, which contains 22 as substring.

It is a D-number.

It is a nialpdrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (27961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4659 + ... + 4664.

It is an arithmetic number, because the mean of its divisors is an integer number (9324).

2²⁷⁹⁶⁹ is an apocalyptic number.

It is an amenable number.

27969 is a deficient number, since it is larger than the sum of its proper divisors (9327).

27969 is an equidigital number, since it uses as much as digits as its factorization.

27969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9326.

The product of its digits is 6804, while the sum is 33.

The square root of 27969 is about 167.2393494367. The cubic root of 27969 is about 30.3546791212.

The spelling of 27969 in words is "twenty-seven thousand, nine hundred sixty-nine".