27986963 has 2 divisors, whose sum is σ = 27986964. Its totient is φ = 27986962.

The previous prime is 27986957. The next prime is 27987007. The reversal of 27986963 is 36968972.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 27986963 - 2¹⁰ = 27985939 is a prime.

It is not a weakly prime, because it can be changed into another prime (27986923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13993481 + 13993482.

It is an arithmetic number, because the mean of its divisors is an integer number (13993482).

Almost surely, 2^27986963 is an apocalyptic number.

27986963 is a deficient number, since it is larger than the sum of its proper divisors (1).

27986963 is an equidigital number, since it uses as much as digits as its factorization.

27986963 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 979776, while the sum is 50.

The square root of 27986963 is about 5290.2705979940. The cubic root of 27986963 is about 303.6117612874.

Subtracting 27986963 from its reverse (36968972), we obtain a square (8982009 = 2997²).

The spelling of 27986963 in words is "twenty-seven million, nine hundred eighty-six thousand, nine hundred sixty-three".