27868139 has 16 divisors (see below), whose sum is σ = 30824640. Its totient is φ = 25038720.

The previous prime is 27868121. The next prime is 27868147. The reversal of 27868139 is 93186872.

It is a cyclic number.

It is not a de Polignac number, because 27868139 - 2¹⁶ = 27802603 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 27868139.

It is not an unprimeable number, because it can be changed into a prime (27868189) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 100469 + ... + 100745.

It is an arithmetic number, because the mean of its divisors is an integer number (1926540).

Almost surely, 2^27868139 is an apocalyptic number.

27868139 is a deficient number, since it is larger than the sum of its proper divisors (2956501).

27868139 is a wasteful number, since it uses less digits than its factorization.

27868139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 470.

The product of its digits is 145152, while the sum is 44.

The square root of 27868139 is about 5279.0282249672. The cubic root of 27868139 is about 303.1814711667.

The spelling of 27868139 in words is "twenty-seven million, eight hundred sixty-eight thousand, one hundred thirty-nine".