11909646 has 64 divisors (see below), whose sum is σ = 30912000. Its totient is φ = 3397464.

The previous prime is 11909621. The next prime is 11909647. The reversal of 11909646 is 64690911.

11909646 is a `hidden beast` number, since 1 + 1 + 9 + 0 + 9 + 646 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 11909646.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11909647) 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 31 ways as a sum of consecutive naturals, for example, 18201 + ... + 18843.

It is an arithmetic number, because the mean of its divisors is an integer number (483000).

Almost surely, 2^11909646 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 11909646, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15456000).

11909646 is an abundant number, since it is smaller than the sum of its proper divisors (19002354).

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

11909646 is an equidigital number, since it uses as much as digits as its factorization.

11909646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 675 (or 655 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 36.

The square root of 11909646 is about 3451.0354967748. The cubic root of 11909646 is about 228.3667918836.

The spelling of 11909646 in words is "eleven million, nine hundred nine thousand, six hundred forty-six".