12139867 has 4 divisors (see below), whose sum is σ = 12276360. Its totient is φ = 12003376.

The previous prime is 12139861. The next prime is 12139871. The reversal of 12139867 is 76893121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 76893121 = 281 ⋅273641.

It is a cyclic number.

It is not a de Polignac number, because 12139867 - 2⁷ = 12139739 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12139861) 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, 68113 + ... + 68290.

It is an arithmetic number, because the mean of its divisors is an integer number (3069090).

Almost surely, 2^12139867 is an apocalyptic number.

12139867 is a deficient number, since it is larger than the sum of its proper divisors (136493).

12139867 is an equidigital number, since it uses as much as digits as its factorization.

12139867 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136492.

The product of its digits is 18144, while the sum is 37.

The square root of 12139867 is about 3484.2311920996. The cubic root of 12139867 is about 229.8289023672.

The spelling of 12139867 in words is "twelve million, one hundred thirty-nine thousand, eight hundred sixty-seven".