11909808 has 80 divisors (see below), whose sum is σ = 36009600. Its totient is φ = 3758400.

The previous prime is 11909801. The next prime is 11909813. The reversal of 11909808 is 80890911.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (11909801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7483 + ... + 8933.

It is an arithmetic number, because the mean of its divisors is an integer number (450120).

Almost surely, 2^11909808 is an apocalyptic number.

11909808 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 11909808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18004800).

11909808 is an abundant number, since it is smaller than the sum of its proper divisors (24099792).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11909808 is a wasteful number, since it uses less digits than its factorization.

11909808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1487 (or 1475 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 36.

The square root of 11909808 is about 3451.0589679112. The cubic root of 11909808 is about 228.3678273259.

The spelling of 11909808 in words is "eleven million, nine hundred nine thousand, eight hundred eight".