2189190878 has 16 divisors (see below), whose sum is σ = 3973657824. Its totient is φ = 883034880.

The previous prime is 2189190851. The next prime is 2189190881. The reversal of 2189190878 is 8780919812.

It is a happy number.

It is a Curzon number.

It is a congruent 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 7 ways as a sum of consecutive naturals, for example, 4598903 + ... + 4599378.

It is an arithmetic number, because the mean of its divisors is an integer number (248353614).

Almost surely, 2^2189190878 is an apocalyptic number.

2189190878 is a deficient number, since it is larger than the sum of its proper divisors (1784466946).

2189190878 is a wasteful number, since it uses less digits than its factorization.

2189190878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9198307.

The product of its (nonzero) digits is 580608, while the sum is 53.

The square root of 2189190878 is about 46788.7900890801. The cubic root of 2189190878 is about 1298.4579107127.

The spelling of 2189190878 in words is "two billion, one hundred eighty-nine million, one hundred ninety thousand, eight hundred seventy-eight".