11921856 has 56 divisors (see below), whose sum is σ = 32577024. Its totient is φ = 3843840.

The previous prime is 11921851. The next prime is 11921867. The reversal of 11921856 is 65812911.

11921856 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11921851) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4951 + ... + 6953.

Almost surely, 2^11921856 is an apocalyptic number.

11921856 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 11921856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16288512).

11921856 is an abundant number, since it is smaller than the sum of its proper divisors (20655168).

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

11921856 is a wasteful number, since it uses less digits than its factorization.

11921856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2049 (or 2039 counting only the distinct ones).

The product of its digits is 4320, while the sum is 33.

The square root of 11921856 is about 3452.8040778475. The cubic root of 11921856 is about 228.4448072497. Note that the first 3 decimals are identical.

The spelling of 11921856 in words is "eleven million, nine hundred twenty-one thousand, eight hundred fifty-six".