27989389 has 2 divisors, whose sum is σ = 27989390. Its totient is φ = 27989388.

The previous prime is 27989371. The next prime is 27989417. The reversal of 27989389 is 98398972.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23716900 + 4272489 = 4870^2 + 2067^2 .

It is a cyclic number.

It is not a de Polignac number, because 27989389 - 2¹¹ = 27987341 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27989359) 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, 13994694 + 13994695.

It is an arithmetic number, because the mean of its divisors is an integer number (13994695).

Almost surely, 2^27989389 is an apocalyptic number.

It is an amenable number.

27989389 is a deficient number, since it is larger than the sum of its proper divisors (1).

27989389 is an equidigital number, since it uses as much as digits as its factorization.

27989389 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1959552, while the sum is 55.

The square root of 27989389 is about 5290.4998818637. The cubic root of 27989389 is about 303.6205337153.

The spelling of 27989389 in words is "twenty-seven million, nine hundred eighty-nine thousand, three hundred eighty-nine".