27986155 has 4 divisors (see below), whose sum is σ = 33583392. Its totient is φ = 22388920.

The previous prime is 27986143. The next prime is 27986159. The reversal of 27986155 is 55168972.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 27986155 - 2¹⁹ = 27461867 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27986159) 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 3 ways as a sum of consecutive naturals, for example, 2798611 + ... + 2798620.

It is an arithmetic number, because the mean of its divisors is an integer number (8395848).

Almost surely, 2^27986155 is an apocalyptic number.

27986155 is a deficient number, since it is larger than the sum of its proper divisors (5597237).

27986155 is an equidigital number, since it uses as much as digits as its factorization.

27986155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5597236.

The product of its digits is 151200, while the sum is 43.

The square root of 27986155 is about 5290.1942308388. The cubic root of 27986155 is about 303.6088394428.

The spelling of 27986155 in words is "twenty-seven million, nine hundred eighty-six thousand, one hundred fifty-five".