12405389 has 2 divisors, whose sum is σ = 12405390. Its totient is φ = 12405388.

The previous prime is 12405383. The next prime is 12405391. The reversal of 12405389 is 98350421.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12369289 + 36100 = 3517^2 + 190^2 .

It is a cyclic number.

It is not a de Polignac number, because 12405389 - 2¹² = 12401293 is a prime.

Together with 12405391, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12405383) 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 as a sum of consecutive naturals, namely, 6202694 + 6202695.

It is an arithmetic number, because the mean of its divisors is an integer number (6202695).

Almost surely, 2^12405389 is an apocalyptic number.

It is an amenable number.

12405389 is a deficient number, since it is larger than the sum of its proper divisors (1).

12405389 is an equidigital number, since it uses as much as digits as its factorization.

12405389 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 12405389 is about 3522.1284757941. The cubic root of 12405389 is about 231.4924310276.

The spelling of 12405389 in words is "twelve million, four hundred five thousand, three hundred eighty-nine".