27849905 has 4 divisors (see below), whose sum is σ = 33419892. Its totient is φ = 22279920.

The previous prime is 27849883. The next prime is 27849917. The reversal of 27849905 is 50994872.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 5230369 + 22619536 = 2287^2 + 4756^2 .

It is not a de Polignac number, because 27849905 - 2¹⁴ = 27833521 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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, 2784986 + ... + 2784995.

It is an arithmetic number, because the mean of its divisors is an integer number (8354973).

Almost surely, 2^27849905 is an apocalyptic number.

It is an amenable number.

27849905 is a deficient number, since it is larger than the sum of its proper divisors (5569987).

27849905 is an equidigital number, since it uses as much as digits as its factorization.

27849905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5569986.

The product of its (nonzero) digits is 181440, while the sum is 44.

The square root of 27849905 is about 5277.3009199779. The cubic root of 27849905 is about 303.1153333085.

The spelling of 27849905 in words is "twenty-seven million, eight hundred forty-nine thousand, nine hundred five".