12218985 has 16 divisors (see below), whose sum is σ = 21722880. Its totient is φ = 6516720.

The previous prime is 12218981. The next prime is 12218989. The reversal of 12218985 is 58981221.

It is an interprime number because it is at equal distance from previous prime (12218981) and next prime (12218989).

It is not a de Polignac number, because 12218985 - 2² = 12218981 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12218981) 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 15 ways as a sum of consecutive naturals, for example, 45121 + ... + 45390.

It is an arithmetic number, because the mean of its divisors is an integer number (1357680).

Almost surely, 2^12218985 is an apocalyptic number.

12218985 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12218985 is a deficient number, since it is larger than the sum of its proper divisors (9503895).

12218985 is an equidigital number, since it uses as much as digits as its factorization.

12218985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90525 (or 90519 counting only the distinct ones).

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

The square root of 12218985 is about 3495.5664776971. The cubic root of 12218985 is about 230.3271023177.

It can be divided in two parts, 12218 and 985, that added together give a triangular number (13203 = T₁₆₂).

The spelling of 12218985 in words is "twelve million, two hundred eighteen thousand, nine hundred eighty-five".