12402389 has 2 divisors, whose sum is σ = 12402390. Its totient is φ = 12402388.

The previous prime is 12402353. The next prime is 12402391. The reversal of 12402389 is 98320421.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11847364 + 555025 = 3442^2 + 745^2 .

It is a cyclic number.

It is not a de Polignac number, because 12402389 - 2⁸ = 12402133 is a prime.

Together with 12402391, 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 (12402349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6201194 + 6201195.

It is an arithmetic number, because the mean of its divisors is an integer number (6201195).

Almost surely, 2^12402389 is an apocalyptic number.

It is an amenable number.

12402389 is a deficient number, since it is larger than the sum of its proper divisors (1).

12402389 is an equidigital number, since it uses as much as digits as its factorization.

12402389 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 12402389 is about 3521.7025712005. The cubic root of 12402389 is about 231.4737688886.

The spelling of 12402389 in words is "twelve million, four hundred two thousand, three hundred eighty-nine".