12740209 has 2 divisors, whose sum is σ = 12740210. Its totient is φ = 12740208.

The previous prime is 12740201. The next prime is 12740249. The reversal of 12740209 is 90204721.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11122225 + 1617984 = 3335^2 + 1272^2 .

It is an emirp because it is prime and its reverse (90204721) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12740209 - 2³ = 12740201 is a prime.

It is equal to p₈₃₃₄₂₅ and since 12740209 and 833425 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (12740201) 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, 6370104 + 6370105.

It is an arithmetic number, because the mean of its divisors is an integer number (6370105).

Almost surely, 2^12740209 is an apocalyptic number.

It is an amenable number.

12740209 is a deficient number, since it is larger than the sum of its proper divisors (1).

12740209 is an equidigital number, since it uses as much as digits as its factorization.

12740209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 12740209 is about 3569.3429367322. The cubic root of 12740209 is about 233.5566214040.

The spelling of 12740209 in words is "twelve million, seven hundred forty thousand, two hundred nine".