11857409 has 2 divisors, whose sum is σ = 11857410. Its totient is φ = 11857408.

The previous prime is 11857393. The next prime is 11857423. The reversal of 11857409 is 90475811.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6553600 + 5303809 = 2560^2 + 2303^2 .

It is an emirp because it is prime and its reverse (90475811) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11857409 - 2⁴ = 11857393 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (11857499) 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, 5928704 + 5928705.

It is an arithmetic number, because the mean of its divisors is an integer number (5928705).

Almost surely, 2^11857409 is an apocalyptic number.

It is an amenable number.

11857409 is a deficient number, since it is larger than the sum of its proper divisors (1).

11857409 is an equidigital number, since it uses as much as digits as its factorization.

11857409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10080, while the sum is 35.

The square root of 11857409 is about 3443.4588715418. The cubic root of 11857409 is about 228.0324220334.

The spelling of 11857409 in words is "eleven million, eight hundred fifty-seven thousand, four hundred nine".