12139538 has 16 divisors (see below), whose sum is σ = 19616256. Its totient is φ = 5617920.

The previous prime is 12139531. The next prime is 12139541. The reversal of 12139538 is 83593121.

It is not an unprimeable number, because it can be changed into a prime (12139531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2831 + ... + 5682.

It is an arithmetic number, because the mean of its divisors is an integer number (1226016).

Almost surely, 2^12139538 is an apocalyptic number.

12139538 is a deficient number, since it is larger than the sum of its proper divisors (7476718).

12139538 is a wasteful number, since it uses less digits than its factorization.

12139538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8569.

The product of its digits is 6480, while the sum is 32.

The square root of 12139538 is about 3484.1839790688. The cubic root of 12139538 is about 229.8268261667.

The spelling of 12139538 in words is "twelve million, one hundred thirty-nine thousand, five hundred thirty-eight".