11909823 has 16 divisors (see below), whose sum is σ = 16284672. Its totient is φ = 7740000.

The previous prime is 11909813. The next prime is 11909851. The reversal of 11909823 is 32890911.

11909823 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 11909823 - 2⁶ = 11909759 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11909813) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27418 + ... + 27848.

It is an arithmetic number, because the mean of its divisors is an integer number (1017792).

Almost surely, 2^11909823 is an apocalyptic number.

11909823 is a deficient number, since it is larger than the sum of its proper divisors (4374849).

11909823 is a wasteful number, since it uses less digits than its factorization.

11909823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 646.

The product of its (nonzero) digits is 3888, while the sum is 33.

The square root of 11909823 is about 3451.0611411564. The cubic root of 11909823 is about 228.3679231997.

The spelling of 11909823 in words is "eleven million, nine hundred nine thousand, eight hundred twenty-three".