27797309 has 2 divisors, whose sum is σ = 27797310. Its totient is φ = 27797308.

The previous prime is 27797299. The next prime is 27797311. The reversal of 27797309 is 90379772.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22944100 + 4853209 = 4790^2 + 2203^2 .

It is a cyclic number.

It is not a de Polignac number, because 27797309 - 2⁸ = 27797053 is a prime.

It is a Sophie Germain prime.

Together with 27797311, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 27797309.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27797369) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13898654 + 13898655.

It is an arithmetic number, because the mean of its divisors is an integer number (13898655).

Almost surely, 2^27797309 is an apocalyptic number.

It is an amenable number.

27797309 is a deficient number, since it is larger than the sum of its proper divisors (1).

27797309 is an equidigital number, since it uses as much as digits as its factorization.

27797309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 166698, while the sum is 44.

The square root of 27797309 is about 5272.3153357894. The cubic root of 27797309 is about 302.9243966812.

The spelling of 27797309 in words is "twenty-seven million, seven hundred ninety-seven thousand, three hundred nine".