11985855 has 32 divisors (see below), whose sum is σ = 22061568. Its totient is φ = 5443200.

The previous prime is 11985847. The next prime is 11985859. The reversal of 11985855 is 55858911.

It is not a de Polignac number, because 11985855 - 2³ = 11985847 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11985859) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 21885 + ... + 22425.

It is an arithmetic number, because the mean of its divisors is an integer number (689424).

Almost surely, 2^11985855 is an apocalyptic number.

11985855 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

11985855 is a deficient number, since it is larger than the sum of its proper divisors (10075713).

11985855 is a wasteful number, since it uses less digits than its factorization.

11985855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 767.

The product of its digits is 72000, while the sum is 42.

The square root of 11985855 is about 3462.0593582433. The cubic root of 11985855 is about 228.8528576816.

The spelling of 11985855 in words is "eleven million, nine hundred eighty-five thousand, eight hundred fifty-five".