12187985 has 8 divisors (see below), whose sum is σ = 15021096. Its totient is φ = 9486720.

The previous prime is 12187951. The next prime is 12188003. The reversal of 12187985 is 58978121.

It can be written as a sum of positive squares in 4 ways, for example, as 3655744 + 8532241 = 1912^2 + 2921^2 .

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

It is not a de Polignac number, because 12187985 - 2⁸ = 12187729 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32756 + ... + 33125.

It is an arithmetic number, because the mean of its divisors is an integer number (1877637).

Almost surely, 2^12187985 is an apocalyptic number.

It is an amenable number.

12187985 is a deficient number, since it is larger than the sum of its proper divisors (2833111).

12187985 is an equidigital number, since it uses as much as digits as its factorization.

12187985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65923.

The product of its digits is 40320, while the sum is 41.

The square root of 12187985 is about 3491.1294733940. The cubic root of 12187985 is about 230.1321546751.

The spelling of 12187985 in words is "twelve million, one hundred eighty-seven thousand, nine hundred eighty-five".