12478409 has 2 divisors, whose sum is σ = 12478410. Its totient is φ = 12478408.

The previous prime is 12478393. The next prime is 12478451. The reversal of 12478409 is 90487421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11833600 + 644809 = 3440^2 + 803^2 .

It is a cyclic number.

It is not a de Polignac number, because 12478409 - 2⁴ = 12478393 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (12478009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6239204 + 6239205.

It is an arithmetic number, because the mean of its divisors is an integer number (6239205).

Almost surely, 2^12478409 is an apocalyptic number.

It is an amenable number.

12478409 is a deficient number, since it is larger than the sum of its proper divisors (1).

12478409 is an equidigital number, since it uses as much as digits as its factorization.

12478409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 12478409 is about 3532.4791577588. The cubic root of 12478409 is about 231.9457426131.

The spelling of 12478409 in words is "twelve million, four hundred seventy-eight thousand, four hundred nine".