12011985 has 12 divisors (see below), whose sum is σ = 20820852. Its totient is φ = 6406368.

The previous prime is 12011983. The next prime is 12012017. The reversal of 12011985 is 58911021.

It can be written as a sum of positive squares in 2 ways, for example, as 7096896 + 4915089 = 2664^2 + 2217^2 .

It is not a de Polignac number, because 12011985 - 2¹ = 12011983 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12011983) 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 11 ways as a sum of consecutive naturals, for example, 133422 + ... + 133511.

It is an arithmetic number, because the mean of its divisors is an integer number (1735071).

Almost surely, 2^12011985 is an apocalyptic number.

12011985 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12011985 is a deficient number, since it is larger than the sum of its proper divisors (8808867).

12011985 is a wasteful number, since it uses less digits than its factorization.

12011985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 266944 (or 266941 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 27.

The square root of 12011985 is about 3465.8310691665. The cubic root of 12011985 is about 229.0190420402.

It can be divided in two parts, 12011 and 985, that added together give a square (12996 = 114²).

The spelling of 12011985 in words is "twelve million, eleven thousand, nine hundred eighty-five".