12404389 has 2 divisors, whose sum is σ = 12404390. Its totient is φ = 12404388.

The previous prime is 12404387. The next prime is 12404401. The reversal of 12404389 is 98340421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9253764 + 3150625 = 3042^2 + 1775^2 .

It is a cyclic number.

It is not a de Polignac number, because 12404389 - 2¹ = 12404387 is a prime.

Together with 12404387, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 12404389.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12404387) 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, 6202194 + 6202195.

It is an arithmetic number, because the mean of its divisors is an integer number (6202195).

Almost surely, 2^12404389 is an apocalyptic number.

It is an amenable number.

12404389 is a deficient number, since it is larger than the sum of its proper divisors (1).

12404389 is an equidigital number, since it uses as much as digits as its factorization.

12404389 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 12404389 is about 3521.9865133189. The cubic root of 12404389 is about 231.4862106489.

The spelling of 12404389 in words is "twelve million, four hundred four thousand, three hundred eighty-nine".