11908809 has 32 divisors (see below), whose sum is σ = 19486080. Its totient is φ = 7128000.

The previous prime is 11908777. The next prime is 11908811. The reversal of 11908809 is 90880911.

It is not a de Polignac number, because 11908809 - 2⁵ = 11908777 is a prime.

It is a nialpdrome in base 8.

It is a zygodrome in base 8.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11908849) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 29799 + ... + 30195.

It is an arithmetic number, because the mean of its divisors is an integer number (608940).

Almost surely, 2^11908809 is an apocalyptic number.

It is an amenable number.

11908809 is a deficient number, since it is larger than the sum of its proper divisors (7577271).

11908809 is a wasteful number, since it uses less digits than its factorization.

11908809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 518 (or 512 counting only the distinct ones).

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

The square root of 11908809 is about 3450.9142266941. The cubic root of 11908809 is about 228.3614419490.

It can be divided in two parts, 1190 and 8809, that added together give a palindrome (9999).

The spelling of 11908809 in words is "eleven million, nine hundred eight thousand, eight hundred nine".