12391739 has 2 divisors, whose sum is σ = 12391740. Its totient is φ = 12391738.

The previous prime is 12391727. The next prime is 12391747. The reversal of 12391739 is 93719321.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12391739 - 2¹⁶ = 12326203 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 12391699 and 12391708.

It is not a weakly prime, because it can be changed into another prime (12391789) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6195869 + 6195870.

It is an arithmetic number, because the mean of its divisors is an integer number (6195870).

Almost surely, 2^12391739 is an apocalyptic number.

12391739 is a deficient number, since it is larger than the sum of its proper divisors (1).

12391739 is an equidigital number, since it uses as much as digits as its factorization.

12391739 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10206, while the sum is 35.

The square root of 12391739 is about 3520.1901937253. The cubic root of 12391739 is about 231.4074939797.

The spelling of 12391739 in words is "twelve million, three hundred ninety-one thousand, seven hundred thirty-nine".