27979123 has 2 divisors, whose sum is σ = 27979124. Its totient is φ = 27979122.

The previous prime is 27979079. The next prime is 27979181. The reversal of 27979123 is 32197972.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 27979123 - 2¹³ = 27970931 is a prime.

It is not a weakly prime, because it can be changed into another prime (27979423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13989561 + 13989562.

It is an arithmetic number, because the mean of its divisors is an integer number (13989562).

Almost surely, 2^27979123 is an apocalyptic number.

27979123 is a deficient number, since it is larger than the sum of its proper divisors (1).

27979123 is an equidigital number, since it uses as much as digits as its factorization.

27979123 is an evil number, because the sum of its binary digits is even.

The product of its digits is 47628, while the sum is 40.

The square root of 27979123 is about 5289.5295632031. The cubic root of 27979123 is about 303.5834083419.

The spelling of 27979123 in words is "twenty-seven million, nine hundred seventy-nine thousand, one hundred twenty-three".