27856943 has 2 divisors, whose sum is σ = 27856944. Its totient is φ = 27856942.

The previous prime is 27856883. The next prime is 27856957. The reversal of 27856943 is 34965872.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 27856943 - 2²⁴ = 11079727 is a prime.

It is a Sophie Germain prime.

It is an alternating number because its digits alternate between even and odd.

It is a junction number, because it is equal to n+sod(n) for n = 27856894 and 27856903.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27856963) by changing a digit.

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

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13928471 + 13928472.

It is an arithmetic number, because the mean of its divisors is an integer number (13928472).

Almost surely, 2^27856943 is an apocalyptic number.

27856943 is a deficient number, since it is larger than the sum of its proper divisors (1).

27856943 is an equidigital number, since it uses as much as digits as its factorization.

27856943 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 362880, while the sum is 44.

The square root of 27856943 is about 5277.9676959981. The cubic root of 27856943 is about 303.1408647664.

The spelling of 27856943 in words is "twenty-seven million, eight hundred fifty-six thousand, nine hundred forty-three".