27774389 has 2 divisors, whose sum is σ = 27774390. Its totient is φ = 27774388.

The previous prime is 27774377. The next prime is 27774391. The reversal of 27774389 is 98347772.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20857489 + 6916900 = 4567^2 + 2630^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27774389 is a prime.

Together with 27774391, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27774359) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13887194 + 13887195.

It is an arithmetic number, because the mean of its divisors is an integer number (13887195).

Almost surely, 2^27774389 is an apocalyptic number.

It is an amenable number.

27774389 is a deficient number, since it is larger than the sum of its proper divisors (1).

27774389 is an equidigital number, since it uses as much as digits as its factorization.

27774389 is an evil number, because the sum of its binary digits is even.

The product of its digits is 592704, while the sum is 47.

The square root of 27774389 is about 5270.1412694538. The cubic root of 27774389 is about 302.8411160021.

The spelling of 27774389 in words is "twenty-seven million, seven hundred seventy-four thousand, three hundred eighty-nine".