27856139 has 2 divisors, whose sum is σ = 27856140. Its totient is φ = 27856138.

The previous prime is 27856123. The next prime is 27856163. The reversal of 27856139 is 93165872.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 27856139 - 2⁴ = 27856123 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 27856096 and 27856105.

It is not a weakly prime, because it can be changed into another prime (27856639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13928069 + 13928070.

It is an arithmetic number, because the mean of its divisors is an integer number (13928070).

Almost surely, 2^27856139 is an apocalyptic number.

27856139 is a deficient number, since it is larger than the sum of its proper divisors (1).

27856139 is an equidigital number, since it uses as much as digits as its factorization.

27856139 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 90720, while the sum is 41.

The square root of 27856139 is about 5277.8915297683. The cubic root of 27856139 is about 303.1379483469.

The spelling of 27856139 in words is "twenty-seven million, eight hundred fifty-six thousand, one hundred thirty-nine".