11523809 has 16 divisors (see below), whose sum is σ = 12960000. Its totient is φ = 10158720.

The previous prime is 11523781. The next prime is 11523833. The reversal of 11523809 is 90832511.

It is not a de Polignac number, because 11523809 - 2⁸ = 11523553 is a prime.

It is a Duffinian number.

11523809 is a modest number, since divided by 523809 gives 11 as remainder.

It is not an unprimeable number, because it can be changed into a prime (11523839) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 77267 + ... + 77415.

It is an arithmetic number, because the mean of its divisors is an integer number (810000).

Almost surely, 2^11523809 is an apocalyptic number.

It is an amenable number.

11523809 is a deficient number, since it is larger than the sum of its proper divisors (1436191).

11523809 is a wasteful number, since it uses less digits than its factorization.

11523809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 328.

The product of its (nonzero) digits is 2160, while the sum is 29.

The square root of 11523809 is about 3394.6736220143. The cubic root of 11523809 is about 225.8735358985.

The spelling of 11523809 in words is "eleven million, five hundred twenty-three thousand, eight hundred nine".