12665139 has 4 divisors (see below), whose sum is σ = 16886856. Its totient is φ = 8443424.

The previous prime is 12665131. The next prime is 12665167. The reversal of 12665139 is 93156621.

It is a happy number.

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 12665139 - 2³ = 12665131 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12665131) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2110854 + ... + 2110859.

It is an arithmetic number, because the mean of its divisors is an integer number (4221714).

Almost surely, 2^12665139 is an apocalyptic number.

12665139 is a deficient number, since it is larger than the sum of its proper divisors (4221717).

12665139 is an equidigital number, since it uses as much as digits as its factorization.

12665139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4221716.

The product of its digits is 9720, while the sum is 33.

The square root of 12665139 is about 3558.8114589003. The cubic root of 12665139 is about 233.0969835782.

The spelling of 12665139 in words is "twelve million, six hundred sixty-five thousand, one hundred thirty-nine".