12426409 has 2 divisors, whose sum is σ = 12426410. Its totient is φ = 12426408.

The previous prime is 12426389. The next prime is 12426431. The reversal of 12426409 is 90462421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12425625 + 784 = 3525^2 + 28^2 .

It is a cyclic number.

It is not a de Polignac number, because 12426409 - 2²¹ = 10329257 is a prime.

It is not a weakly prime, because it can be changed into another prime (12426499) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6213204 + 6213205.

It is an arithmetic number, because the mean of its divisors is an integer number (6213205).

Almost surely, 2^12426409 is an apocalyptic number.

It is an amenable number.

12426409 is a deficient number, since it is larger than the sum of its proper divisors (1).

12426409 is an equidigital number, since it uses as much as digits as its factorization.

12426409 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 28.

The square root of 12426409 is about 3525.1112039197. Note that the first 3 decimals coincide. The cubic root of 12426409 is about 231.6231060953.

The spelling of 12426409 in words is "twelve million, four hundred twenty-six thousand, four hundred nine".