12139986 has 16 divisors (see below), whose sum is σ = 24317568. Its totient is φ = 4040400.

The previous prime is 12139979. The next prime is 12139991. The reversal of 12139986 is 68993121.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4356 + ... + 6576.

It is an arithmetic number, because the mean of its divisors is an integer number (1519848).

Almost surely, 2^12139986 is an apocalyptic number.

12139986 is an abundant number, since it is smaller than the sum of its proper divisors (12177582).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12139986 is a wasteful number, since it uses less digits than its factorization.

12139986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3137.

The product of its digits is 23328, while the sum is 39.

The square root of 12139986 is about 3484.2482689958. The cubic root of 12139986 is about 229.8296533241.

The spelling of 12139986 in words is "twelve million, one hundred thirty-nine thousand, nine hundred eighty-six".