11991204 has 72 divisors (see below), whose sum is σ = 32672640. Its totient is φ = 3696192.

The previous prime is 11991167. The next prime is 11991209. The reversal of 11991204 is 40219911.

It is not an unprimeable number, because it can be changed into a prime (11991209) 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 23 ways as a sum of consecutive naturals, for example, 31962 + ... + 32334.

Almost surely, 2^11991204 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 11991204, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16336320).

11991204 is an abundant number, since it is smaller than the sum of its proper divisors (20681436).

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

11991204 is a wasteful number, since it uses less digits than its factorization.

11991204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 449 (or 444 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 27.

The square root of 11991204 is about 3462.8317891575. The cubic root of 11991204 is about 228.8868964682.

The spelling of 11991204 in words is "eleven million, nine hundred ninety-one thousand, two hundred four".