12724009 has 2 divisors, whose sum is σ = 12724010. Its totient is φ = 12724008.

The previous prime is 12723979. The next prime is 12724021. The reversal of 12724009 is 90042721.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7683984 + 5040025 = 2772^2 + 2245^2 .

It is an emirp because it is prime and its reverse (90042721) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12724009 - 2¹³ = 12715817 is a prime.

It is not a weakly prime, because it can be changed into another prime (12724039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6362004 + 6362005.

It is an arithmetic number, because the mean of its divisors is an integer number (6362005).

Almost surely, 2^12724009 is an apocalyptic number.

It is an amenable number.

12724009 is a deficient number, since it is larger than the sum of its proper divisors (1).

12724009 is an equidigital number, since it uses as much as digits as its factorization.

12724009 is an evil number, because the sum of its binary digits is even.

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

The square root of 12724009 is about 3567.0728896393. The cubic root of 12724009 is about 233.4575852970.

The spelling of 12724009 in words is "twelve million, seven hundred twenty-four thousand, nine".