2129189808 has 20 divisors (see below), whose sum is σ = 5500407128. Its totient is φ = 709729920.

The previous prime is 2129189807. The next prime is 2129189861. The reversal of 2129189808 is 8089819212.

It is a Harshad number since it is a multiple of its sum of digits (48), and also a Moran number because the ratio is a prime number: 44358121 = 2129189808 / (2 + 1 + 2 + 9 + 1 + 8 + 9 + 8 + 0 + 8).

It is not an unprimeable number, because it can be changed into a prime (2129189801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22179013 + ... + 22179108.

Almost surely, 2^2129189808 is an apocalyptic number.

It is an amenable number.

2129189808 is an abundant number, since it is smaller than the sum of its proper divisors (3371217320).

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

2129189808 is a wasteful number, since it uses less digits than its factorization.

2129189808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44358132 (or 44358126 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 48.

The square root of 2129189808 is about 46143.1447562907. The cubic root of 2129189808 is about 1286.4851956057.

The spelling of 2129189808 in words is "two billion, one hundred twenty-nine million, one hundred eighty-nine thousand, eight hundred eight".