11821856 has 24 divisors (see below), whose sum is σ = 23559984. Its totient is φ = 5838400.

The previous prime is 11821853. The next prime is 11821871. The reversal of 11821856 is 65812811.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is not an unprimeable number, because it can be changed into a prime (11821853) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 431 + ... + 4881.

It is an arithmetic number, because the mean of its divisors is an integer number (981666).

Almost surely, 2^11821856 is an apocalyptic number.

11821856 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

11821856 is a deficient number, since it is larger than the sum of its proper divisors (11738128).

11821856 is an equidigital number, since it uses as much as digits as its factorization.

11821856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4544 (or 4536 counting only the distinct ones).

The product of its digits is 3840, while the sum is 32.

The square root of 11821856 is about 3438.2925995325. The cubic root of 11821856 is about 227.8042846981.

The spelling of 11821856 in words is "eleven million, eight hundred twenty-one thousand, eight hundred fifty-six".