27859891 has 2 divisors, whose sum is σ = 27859892. Its totient is φ = 27859890.

The previous prime is 27859883. The next prime is 27859907. The reversal of 27859891 is 19895872.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 27859891 - 2³ = 27859883 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (27859591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13929945 + 13929946.

It is an arithmetic number, because the mean of its divisors is an integer number (13929946).

Almost surely, 2^27859891 is an apocalyptic number.

27859891 is a deficient number, since it is larger than the sum of its proper divisors (1).

27859891 is an equidigital number, since it uses as much as digits as its factorization.

27859891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 362880, while the sum is 49.

The square root of 27859891 is about 5278.2469627709. The cubic root of 27859891 is about 303.1515578247.

The spelling of 27859891 in words is "twenty-seven million, eight hundred fifty-nine thousand, eight hundred ninety-one".