27979 has 6 divisors (see below), whose sum is σ = 32604. Its totient is φ = 23940.

The previous prime is 27967. The next prime is 27983. The reversal of 27979 is 97972.

It is not a de Polignac number, because 27979 - 2⁵ = 27947 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 6 and base 13.

It is a zygodrome in base 6.

It is not an unprimeable number, because it can be changed into a prime (27919) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 237 + ... + 334.

It is an arithmetic number, because the mean of its divisors is an integer number (5434).

2²⁷⁹⁷⁹ is an apocalyptic number.

27979 is a deficient number, since it is larger than the sum of its proper divisors (4625).

27979 is an equidigital number, since it uses as much as digits as its factorization.

27979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 585 (or 578 counting only the distinct ones).

The product of its digits is 7938, while the sum is 34.

The square root of 27979 is about 167.2692440349. The cubic root of 27979 is about 30.3582963477.

The spelling of 27979 in words is "twenty-seven thousand, nine hundred seventy-nine".