27990187 has 2 divisors, whose sum is σ = 27990188. Its totient is φ = 27990186.

The previous prime is 27990169. The next prime is 27990199. The reversal of 27990187 is 78109972.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 27990187 - 2¹⁹ = 27465899 is a prime.

It is not a weakly prime, because it can be changed into another prime (27990107) 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, 13995093 + 13995094.

It is an arithmetic number, because the mean of its divisors is an integer number (13995094).

Almost surely, 2^27990187 is an apocalyptic number.

27990187 is a deficient number, since it is larger than the sum of its proper divisors (1).

27990187 is an equidigital number, since it uses as much as digits as its factorization.

27990187 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 63504, while the sum is 43.

The square root of 27990187 is about 5290.5752995303. The cubic root of 27990187 is about 303.6234191765.

The spelling of 27990187 in words is "twenty-seven million, nine hundred ninety thousand, one hundred eighty-seven".