12427409 has 2 divisors, whose sum is σ = 12427410. Its totient is φ = 12427408.

The previous prime is 12427403. The next prime is 12427421. The reversal of 12427409 is 90472421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8427409 + 4000000 = 2903^2 + 2000^2 .

It is a cyclic number.

It is not a de Polignac number, because 12427409 - 2²⁰ = 11378833 is a prime.

It is not a weakly prime, because it can be changed into another prime (12427403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6213704 + 6213705.

It is an arithmetic number, because the mean of its divisors is an integer number (6213705).

Almost surely, 2^12427409 is an apocalyptic number.

It is an amenable number.

12427409 is a deficient number, since it is larger than the sum of its proper divisors (1).

12427409 is an equidigital number, since it uses as much as digits as its factorization.

12427409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 12427409 is about 3525.2530405632. The cubic root of 12427409 is about 231.6293191236.

The spelling of 12427409 in words is "twelve million, four hundred twenty-seven thousand, four hundred nine".