11806409 has 2 divisors, whose sum is σ = 11806410. Its totient is φ = 11806408.

The previous prime is 11806397. The next prime is 11806411. The reversal of 11806409 is 90460811.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11751184 + 55225 = 3428^2 + 235^2 .

It is a cyclic number.

It is not a de Polignac number, because 11806409 - 2¹² = 11802313 is a prime.

Together with 11806411, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (11806469) 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, 5903204 + 5903205.

It is an arithmetic number, because the mean of its divisors is an integer number (5903205).

Almost surely, 2^11806409 is an apocalyptic number.

It is an amenable number.

11806409 is a deficient number, since it is larger than the sum of its proper divisors (1).

11806409 is an equidigital number, since it uses as much as digits as its factorization.

11806409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 29.

The square root of 11806409 is about 3436.0455468460. The cubic root of 11806409 is about 227.7050214761.

The spelling of 11806409 in words is "eleven million, eight hundred six thousand, four hundred nine".