11987808 has 48 divisors (see below), whose sum is σ = 35965440. Its totient is φ = 3424896.

The previous prime is 11987783. The next prime is 11987837. The reversal of 11987808 is 80878911.

It is a tau number, because it is divible by the number of its divisors (48).

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a self number, because there is not a number n which added to its sum of digits gives 11987808.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 8248 + ... + 9591.

It is an arithmetic number, because the mean of its divisors is an integer number (749280).

Almost surely, 2^11987808 is an apocalyptic number.

It is an amenable number.

11987808 is an abundant number, since it is smaller than the sum of its proper divisors (23977632).

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

11987808 is a wasteful number, since it uses less digits than its factorization.

11987808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17859 (or 17851 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 42.

The square root of 11987808 is about 3462.3414043101. The cubic root of 11987808 is about 228.8652869258.

The spelling of 11987808 in words is "eleven million, nine hundred eighty-seven thousand, eight hundred eight".