12942409 has 2 divisors, whose sum is σ = 12942410. Its totient is φ = 12942408.

The previous prime is 12942403. The next prime is 12942427. The reversal of 12942409 is 90424921.

It is a happy number.

12942409 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11833600 + 1108809 = 3440^2 + 1053^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12942409 is a prime.

It is not a weakly prime, because it can be changed into another prime (12942403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6471204 + 6471205.

It is an arithmetic number, because the mean of its divisors is an integer number (6471205).

Almost surely, 2^12942409 is an apocalyptic number.

It is an amenable number.

12942409 is a deficient number, since it is larger than the sum of its proper divisors (1).

12942409 is an equidigital number, since it uses as much as digits as its factorization.

12942409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 12942409 is about 3597.5559759370. Note that the first 3 decimals coincide. The cubic root of 12942409 is about 234.7857349850.

The spelling of 12942409 in words is "twelve million, nine hundred forty-two thousand, four hundred nine".