11855816 has 16 divisors (see below), whose sum is σ = 25405440. Its totient is φ = 5081040.

The previous prime is 11855813. The next prime is 11855827. The reversal of 11855816 is 61855811.

It is not an unprimeable number, because it can be changed into a prime (11855813) 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 3 ways as a sum of consecutive naturals, for example, 105800 + ... + 105911.

It is an arithmetic number, because the mean of its divisors is an integer number (1587840).

Almost surely, 2^11855816 is an apocalyptic number.

It is an amenable number.

11855816 is an abundant number, since it is smaller than the sum of its proper divisors (13549624).

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

11855816 is a wasteful number, since it uses less digits than its factorization.

11855816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 211724 (or 211720 counting only the distinct ones).

The product of its digits is 9600, while the sum is 35.

The square root of 11855816 is about 3443.2275556518. The cubic root of 11855816 is about 228.0222097991.

The spelling of 11855816 in words is "eleven million, eight hundred fifty-five thousand, eight hundred sixteen".