12897139 has 4 divisors (see below), whose sum is σ = 12925224. Its totient is φ = 12869056.

The previous prime is 12897103. The next prime is 12897163. The reversal of 12897139 is 93179821.

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

It is a cyclic number.

It is not a de Polignac number, because 12897139 - 2⁷ = 12897011 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12897439) 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, 13342 + ... + 14275.

It is an arithmetic number, because the mean of its divisors is an integer number (3231306).

Almost surely, 2^12897139 is an apocalyptic number.

12897139 is a deficient number, since it is larger than the sum of its proper divisors (28085).

12897139 is an equidigital number, since it uses as much as digits as its factorization.

12897139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28084.

The product of its digits is 27216, while the sum is 40.

The square root of 12897139 is about 3591.2586929933. The cubic root of 12897139 is about 234.5116704275.

The spelling of 12897139 in words is "twelve million, eight hundred ninety-seven thousand, one hundred thirty-nine".