12306391 has 4 divisors (see below), whose sum is σ = 12421512. Its totient is φ = 12191272.

The previous prime is 12306379. The next prime is 12306407. The reversal of 12306391 is 19360321.

12306391 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19360321 = 2803 ⋅6907.

It is a cyclic number.

It is not a de Polignac number, because 12306391 - 2⁹ = 12305879 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12306331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 57400 + ... + 57613.

It is an arithmetic number, because the mean of its divisors is an integer number (3105378).

Almost surely, 2^12306391 is an apocalyptic number.

12306391 is a deficient number, since it is larger than the sum of its proper divisors (115121).

12306391 is a wasteful number, since it uses less digits than its factorization.

12306391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115120.

The product of its (nonzero) digits is 972, while the sum is 25.

The square root of 12306391 is about 3508.0466074441. The cubic root of 12306391 is about 230.8749971786.

The spelling of 12306391 in words is "twelve million, three hundred six thousand, three hundred ninety-one".