12139443 has 8 divisors (see below), whose sum is σ = 17984400. Its totient is φ = 8092944.

The previous prime is 12139417. The next prime is 12139447. The reversal of 12139443 is 34493121.

12139443 is a `hidden beast` number, since 1 + 213 + 9 + 443 = 666.

12139443 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12139443 - 2⁸ = 12139187 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 449609 = 12139443 / (1 + 2 + 1 + 3 + 9 + 4 + 4 + 3).

It is not an unprimeable number, because it can be changed into a prime (12139447) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 224778 + ... + 224831.

It is an arithmetic number, because the mean of its divisors is an integer number (2248050).

Almost surely, 2^12139443 is an apocalyptic number.

12139443 is a deficient number, since it is larger than the sum of its proper divisors (5844957).

12139443 is an equidigital number, since it uses as much as digits as its factorization.

12139443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 449618 (or 449612 counting only the distinct ones).

The product of its digits is 2592, while the sum is 27.

The square root of 12139443 is about 3484.1703460078. The cubic root of 12139443 is about 229.8262266490.

The spelling of 12139443 in words is "twelve million, one hundred thirty-nine thousand, four hundred forty-three".