12391941 has 4 divisors (see below), whose sum is σ = 16522592. Its totient is φ = 8261292.

The previous prime is 12391937. The next prime is 12391987. The reversal of 12391941 is 14919321.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 14919321 = 3 ⋅4973107.

It is not a de Polignac number, because 12391941 - 2² = 12391937 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12391899 and 12391908.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12391541) 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 3 ways as a sum of consecutive naturals, for example, 2065321 + ... + 2065326.

It is an arithmetic number, because the mean of its divisors is an integer number (4130648).

Almost surely, 2^12391941 is an apocalyptic number.

It is an amenable number.

12391941 is a deficient number, since it is larger than the sum of its proper divisors (4130651).

12391941 is an equidigital number, since it uses as much as digits as its factorization.

12391941 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4130650.

The product of its digits is 1944, while the sum is 30.

The square root of 12391941 is about 3520.2188852400. The cubic root of 12391941 is about 231.4087513781.

The spelling of 12391941 in words is "twelve million, three hundred ninety-one thousand, nine hundred forty-one".