12281985 has 12 divisors (see below), whose sum is σ = 21288852. Its totient is φ = 6550368.

The previous prime is 12281981. The next prime is 12281987. The reversal of 12281985 is 58918221.

It can be written as a sum of positive squares in 2 ways, for example, as 4210704 + 8071281 = 2052^2 + 2841^2 .

It is not a de Polignac number, because 12281985 - 2² = 12281981 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12281981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 136422 + ... + 136511.

It is an arithmetic number, because the mean of its divisors is an integer number (1774071).

Almost surely, 2^12281985 is an apocalyptic number.

12281985 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12281985 is a deficient number, since it is larger than the sum of its proper divisors (9006867).

12281985 is a wasteful number, since it uses less digits than its factorization.

12281985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 272944 (or 272941 counting only the distinct ones).

The product of its digits is 11520, while the sum is 36.

The square root of 12281985 is about 3504.5663069772. The cubic root of 12281985 is about 230.7222726248.

The spelling of 12281985 in words is "twelve million, two hundred eighty-one thousand, nine hundred eighty-five".