11638409 has 2 divisors, whose sum is σ = 11638410. Its totient is φ = 11638408.

The previous prime is 11638349. The next prime is 11638411. The reversal of 11638409 is 90483611.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8832784 + 2805625 = 2972^2 + 1675^2 .

It is a cyclic number.

It is not a de Polignac number, because 11638409 - 2¹² = 11634313 is a prime.

It is a Sophie Germain prime.

Together with 11638411, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (11638439) 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, 5819204 + 5819205.

It is an arithmetic number, because the mean of its divisors is an integer number (5819205).

Almost surely, 2^11638409 is an apocalyptic number.

It is an amenable number.

11638409 is a deficient number, since it is larger than the sum of its proper divisors (1).

11638409 is an equidigital number, since it uses as much as digits as its factorization.

11638409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 11638409 is about 3411.5112486990. The cubic root of 11638409 is about 226.6198103357.

The spelling of 11638409 in words is "eleven million, six hundred thirty-eight thousand, four hundred nine".