11985911 has 8 divisors (see below), whose sum is σ = 13719840. Its totient is φ = 10257408.

The previous prime is 11985907. The next prime is 11985917. The reversal of 11985911 is 11958911.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 11985911 - 2² = 11985907 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11985917) 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 7 ways as a sum of consecutive naturals, for example, 6215 + ... + 7911.

It is an arithmetic number, because the mean of its divisors is an integer number (1714980).

Almost surely, 2^11985911 is an apocalyptic number.

11985911 is a deficient number, since it is larger than the sum of its proper divisors (1733929).

11985911 is a wasteful number, since it uses less digits than its factorization.

11985911 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2713.

The product of its digits is 3240, while the sum is 35.

The square root of 11985911 is about 3462.0674459057. The cubic root of 11985911 is about 228.8532140945.

Subtracting from 11985911 its reverse (11958911), we obtain a cube (27000 = 30³).

The spelling of 11985911 in words is "eleven million, nine hundred eighty-five thousand, nine hundred eleven".