27989371 has 2 divisors, whose sum is σ = 27989372. Its totient is φ = 27989370.

The previous prime is 27989369. The next prime is 27989389. The reversal of 27989371 is 17398972.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 27989371 - 2¹ = 27989369 is a prime.

Together with 27989369, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (27989471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13994685 + 13994686.

It is an arithmetic number, because the mean of its divisors is an integer number (13994686).

Almost surely, 2^27989371 is an apocalyptic number.

27989371 is a deficient number, since it is larger than the sum of its proper divisors (1).

27989371 is an equidigital number, since it uses as much as digits as its factorization.

27989371 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 190512, while the sum is 46.

The square root of 27989371 is about 5290.4981807009. The cubic root of 27989371 is about 303.6204686291.

The spelling of 27989371 in words is "twenty-seven million, nine hundred eighty-nine thousand, three hundred seventy-one".