11823209 has 2 divisors, whose sum is σ = 11823210. Its totient is φ = 11823208.

The previous prime is 11823197. The next prime is 11823241. The reversal of 11823209 is 90232811.

11823209 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7823209 + 4000000 = 2797^2 + 2000^2 .

It is an emirp because it is prime and its reverse (90232811) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11823209 - 2⁴ = 11823193 is a prime.

It is a super-3 number, since 3×11823209³ (a number of 22 digits) contains 333 as substring.

It is equal to p₇₇₇₂₀₃ and since 11823209 and 777203 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 (11823809) 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, 5911604 + 5911605.

It is an arithmetic number, because the mean of its divisors is an integer number (5911605).

Almost surely, 2^11823209 is an apocalyptic number.

It is an amenable number.

11823209 is a deficient number, since it is larger than the sum of its proper divisors (1).

11823209 is an equidigital number, since it uses as much as digits as its factorization.

11823209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 11823209 is about 3438.4893485367. The cubic root of 11823209 is about 227.8129750267.

The spelling of 11823209 in words is "eleven million, eight hundred twenty-three thousand, two hundred nine".