12686139 has 10 divisors (see below), whose sum is σ = 18951020. Its totient is φ = 8457372.

The previous prime is 12686119. The next prime is 12686147. The reversal of 12686139 is 93168621.

12686139 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12686139 - 2¹³ = 12677947 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12686119) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 78229 + ... + 78390.

It is an arithmetic number, because the mean of its divisors is an integer number (1895102).

Almost surely, 2^12686139 is an apocalyptic number.

12686139 is a deficient number, since it is larger than the sum of its proper divisors (6264881).

12686139 is an equidigital number, since it uses as much as digits as its factorization.

12686139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156631 (or 156622 counting only the distinct ones).

The product of its digits is 15552, while the sum is 36.

The square root of 12686139 is about 3561.7606601230. The cubic root of 12686139 is about 233.2257447302.

The spelling of 12686139 in words is "twelve million, six hundred eighty-six thousand, one hundred thirty-nine".