12391207 has 4 divisors (see below), whose sum is σ = 12818520. Its totient is φ = 11963896.

The previous prime is 12391201. The next prime is 12391217. The reversal of 12391207 is 70219321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 70219321 = 4547 ⋅15443.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12391207 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 (12391201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 213613 + ... + 213670.

It is an arithmetic number, because the mean of its divisors is an integer number (3204630).

Almost surely, 2^12391207 is an apocalyptic number.

12391207 is a deficient number, since it is larger than the sum of its proper divisors (427313).

12391207 is an equidigital number, since it uses as much as digits as its factorization.

12391207 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 427312.

The product of its (nonzero) digits is 756, while the sum is 25.

The square root of 12391207 is about 3520.1146288154. The cubic root of 12391207 is about 231.4041823501.

The spelling of 12391207 in words is "twelve million, three hundred ninety-one thousand, two hundred seven".