11985771 has 16 divisors (see below), whose sum is σ = 18448128. Its totient is φ = 6780000.

The previous prime is 11985767. The next prime is 11985773. The reversal of 11985771 is 17758911.

It is not a de Polignac number, because 11985771 - 2² = 11985767 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11985773) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 705 + ... + 4946.

It is an arithmetic number, because the mean of its divisors is an integer number (1153008).

Almost surely, 2^11985771 is an apocalyptic number.

11985771 is a deficient number, since it is larger than the sum of its proper divisors (6462357).

11985771 is a wasteful number, since it uses less digits than its factorization.

11985771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5762.

The product of its digits is 17640, while the sum is 39.

The square root of 11985771 is about 3462.0472267143. The cubic root of 11985771 is about 228.8523230602.

The spelling of 11985771 in words is "eleven million, nine hundred eighty-five thousand, seven hundred seventy-one".