2181889914 has 8 divisors (see below), whose sum is σ = 4363779840. Its totient is φ = 727296636.

The previous prime is 2181889901. The next prime is 2181889991. The reversal of 2181889914 is 4199881812.

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

2181889914 is an admirable number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 181824154 + ... + 181824165.

It is an arithmetic number, because the mean of its divisors is an integer number (545472480).

Almost surely, 2^2181889914 is an apocalyptic number.

2181889914 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2181889914 is a wasteful number, since it uses less digits than its factorization.

2181889914 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 363648324.

The product of its digits is 331776, while the sum is 51.

The square root of 2181889914 is about 46710.7044905127. The cubic root of 2181889914 is about 1297.0128482564.

The spelling of 2181889914 in words is "two billion, one hundred eighty-one million, eight hundred eighty-nine thousand, nine hundred fourteen".