27189891 has 16 divisors (see below), whose sum is σ = 40521120. Its totient is φ = 18018720.

The previous prime is 27189881. The next prime is 27189917. The reversal of 27189891 is 19898172.

It is not a de Polignac number, because 27189891 - 2⁵ = 27189859 is a prime.

It is not an unprimeable number, because it can be changed into a prime (27189871) 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 in 15 ways as a sum of consecutive naturals, for example, 1761 + ... + 7581.

It is an arithmetic number, because the mean of its divisors is an integer number (2532570).

Almost surely, 2^27189891 is an apocalyptic number.

27189891 is a deficient number, since it is larger than the sum of its proper divisors (13331229).

27189891 is a wasteful number, since it uses less digits than its factorization.

27189891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6003 (or 5997 counting only the distinct ones).

The product of its digits is 72576, while the sum is 45.

The square root of 27189891 is about 5214.3926779636. The cubic root of 27189891 is about 300.7016576424.

The spelling of 27189891 in words is "twenty-seven million, one hundred eighty-nine thousand, eight hundred ninety-one".