12391443 has 6 divisors (see below), whose sum is σ = 17898764. Its totient is φ = 8260956.

The previous prime is 12391429. The next prime is 12391451. The reversal of 12391443 is 34419321.

It is not a de Polignac number, because 12391443 - 2⁴ = 12391427 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12391403) 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 5 ways as a sum of consecutive naturals, for example, 688405 + ... + 688422.

Almost surely, 2^12391443 is an apocalyptic number.

12391443 is a deficient number, since it is larger than the sum of its proper divisors (5507321).

12391443 is a wasteful number, since it uses less digits than its factorization.

12391443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1376833 (or 1376830 counting only the distinct ones).

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

The square root of 12391443 is about 3520.1481502914. The cubic root of 12391443 is about 231.4056514306.

The spelling of 12391443 in words is "twelve million, three hundred ninety-one thousand, four hundred forty-three".