27798389 has 2 divisors, whose sum is σ = 27798390. Its totient is φ = 27798388.

The previous prime is 27798377. The next prime is 27798391. The reversal of 27798389 is 98389772.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18447025 + 9351364 = 4295^2 + 3058^2 .

It is a cyclic number.

It is not a de Polignac number, because 27798389 - 2²⁰ = 26749813 is a prime.

Together with 27798391, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 27798389.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27798989) 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, 13899194 + 13899195.

It is an arithmetic number, because the mean of its divisors is an integer number (13899195).

Almost surely, 2^27798389 is an apocalyptic number.

It is an amenable number.

27798389 is a deficient number, since it is larger than the sum of its proper divisors (1).

27798389 is an equidigital number, since it uses as much as digits as its factorization.

27798389 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1524096, while the sum is 53.

The square root of 27798389 is about 5272.4177565895. The cubic root of 27798389 is about 302.9283197721.

The spelling of 27798389 in words is "twenty-seven million, seven hundred ninety-eight thousand, three hundred eighty-nine".