27947999 has 2 divisors, whose sum is σ = 27948000. Its totient is φ = 27947998.

The previous prime is 27947989. The next prime is 27948007. The reversal of 27947999 is 99974972.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 27947999 - 2⁸ = 27947743 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27947989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13973999 + 13974000.

It is an arithmetic number, because the mean of its divisors is an integer number (13974000).

Almost surely, 2^27947999 is an apocalyptic number.

27947999 is a deficient number, since it is larger than the sum of its proper divisors (1).

27947999 is an equidigital number, since it uses as much as digits as its factorization.

27947999 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2571912, while the sum is 56.

The square root of 27947999 is about 5286.5867059947. The cubic root of 27947999 is about 303.4707977624.

The spelling of 27947999 in words is "twenty-seven million, nine hundred forty-seven thousand, nine hundred ninety-nine".