2189181808 has 40 divisors (see below), whose sum is σ = 4776408576. Its totient is φ = 962980800.

The previous prime is 2189181803. The next prime is 2189181809. The reversal of 2189181808 is 8081819812.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2189181803) 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 7 ways as a sum of consecutive naturals, for example, 195166 + ... + 206077.

Almost surely, 2^2189181808 is an apocalyptic number.

It is an amenable number.

2189181808 is an abundant number, since it is smaller than the sum of its proper divisors (2587226768).

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

2189181808 is a wasteful number, since it uses less digits than its factorization.

2189181808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 401293 (or 401287 counting only the distinct ones).

The product of its (nonzero) digits is 73728, while the sum is 46.

The square root of 2189181808 is about 46788.6931640541. The cubic root of 2189181808 is about 1298.4561175039.

The spelling of 2189181808 in words is "two billion, one hundred eighty-nine million, one hundred eighty-one thousand, eight hundred eight".