12123439 has 2 divisors, whose sum is σ = 12123440. Its totient is φ = 12123438.

The previous prime is 12123373. The next prime is 12123467. The reversal of 12123439 is 93432121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12123439 - 2¹⁵ = 12090671 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12123239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6061719 + 6061720.

It is an arithmetic number, because the mean of its divisors is an integer number (6061720).

Almost surely, 2^12123439 is an apocalyptic number.

12123439 is a deficient number, since it is larger than the sum of its proper divisors (1).

12123439 is an equidigital number, since it uses as much as digits as its factorization.

12123439 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1296, while the sum is 25.

The square root of 12123439 is about 3481.8729155442. The cubic root of 12123439 is about 229.7251853170.

The spelling of 12123439 in words is "twelve million, one hundred twenty-three thousand, four hundred thirty-nine".