27913889 has 2 divisors, whose sum is σ = 27913890. Its totient is φ = 27913888.

The previous prime is 27913877. The next prime is 27913891. The reversal of 27913889 is 98831972.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22963264 + 4950625 = 4792^2 + 2225^2 .

It is a cyclic number.

It is not a de Polignac number, because 27913889 - 2¹² = 27909793 is a prime.

Together with 27913891, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (27913829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13956944 + 13956945.

It is an arithmetic number, because the mean of its divisors is an integer number (13956945).

Almost surely, 2^27913889 is an apocalyptic number.

It is an amenable number.

27913889 is a deficient number, since it is larger than the sum of its proper divisors (1).

27913889 is an equidigital number, since it uses as much as digits as its factorization.

27913889 is an evil number, because the sum of its binary digits is even.

The product of its digits is 217728, while the sum is 47.

The square root of 27913889 is about 5283.3596319009. The cubic root of 27913889 is about 303.3472873936.

The spelling of 27913889 in words is "twenty-seven million, nine hundred thirteen thousand, eight hundred eighty-nine".