2104805985 has 8 divisors (see below), whose sum is σ = 3367689600. Its totient is φ = 1122563184.

The previous prime is 2104805981. The next prime is 2104805987. The reversal of 2104805985 is 5895084012.

It is a happy number.

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

It is not a de Polignac number, because 2104805985 - 2² = 2104805981 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2104805981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 70160185 + ... + 70160214.

It is an arithmetic number, because the mean of its divisors is an integer number (420961200).

Almost surely, 2^2104805985 is an apocalyptic number.

It is an amenable number.

2104805985 is a deficient number, since it is larger than the sum of its proper divisors (1262883615).

2104805985 is a wasteful number, since it uses less digits than its factorization.

2104805985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140320407.

The product of its (nonzero) digits is 115200, while the sum is 42.

The square root of 2104805985 is about 45878.1645774981. The cubic root of 2104805985 is about 1281.5553166179. Note that the first 3 decimals are identical.

Adding to 2104805985 its reverse (5895084012), we get a palindrome (7999889997).

The spelling of 2104805985 in words is "two billion, one hundred four million, eight hundred five thousand, nine hundred eighty-five".