2189986985 has 8 divisors (see below), whose sum is σ = 2629543176. Its totient is φ = 1750950400.

The previous prime is 2189986979. The next prime is 2189986993. The reversal of 2189986985 is 5896899812.

It can be written as a sum of positive squares in 4 ways, for example, as 596141056 + 1593845929 = 24416^2 + 39923^2 .

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

It is a de Polignac number, because none of the positive numbers 2^k-2189986985 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 120566 + ... + 137535.

It is an arithmetic number, because the mean of its divisors is an integer number (328692897).

Almost surely, 2^2189986985 is an apocalyptic number.

It is an amenable number.

2189986985 is a deficient number, since it is larger than the sum of its proper divisors (439556191).

2189986985 is a wasteful number, since it uses less digits than its factorization.

2189986985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 259803.

The product of its digits is 22394880, while the sum is 65.

The square root of 2189986985 is about 46797.2967702195. The cubic root of 2189986985 is about 1298.6152879068.

The spelling of 2189986985 in words is "two billion, one hundred eighty-nine million, nine hundred eighty-six thousand, nine hundred eighty-five".