11921664 has 108 divisors (see below), whose sum is σ = 34265616. Its totient is φ = 3677184.

The previous prime is 11921633. The next prime is 11921669. The reversal of 11921664 is 46612911.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (11921669) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 277227 + ... + 277269.

Almost surely, 2^11921664 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 11921664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17132808).

11921664 is an abundant number, since it is smaller than the sum of its proper divisors (22343952).

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

11921664 is an equidigital number, since it uses as much as digits as its factorization.

11921664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100 (or 67 counting only the distinct ones).

The product of its digits is 2592, while the sum is 30.

The square root of 11921664 is about 3452.7762742466. The cubic root of 11921664 is about 228.4435808848.

The spelling of 11921664 in words is "eleven million, nine hundred twenty-one thousand, six hundred sixty-four".