2189784500 has 24 divisors (see below), whose sum is σ = 4782490440. Its totient is φ = 875913600.

The previous prime is 2189784497. The next prime is 2189784511. The reversal of 2189784500 is 54879812.

It can be written as a sum of positive squares in 4 ways, for example, as 142945936 + 2046838564 = 11956^2 + 45242^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2189285 + ... + 2190284.

It is an arithmetic number, because the mean of its divisors is an integer number (199270435).

Almost surely, 2^2189784500 is an apocalyptic number.

2189784500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2189784500 is an abundant number, since it is smaller than the sum of its proper divisors (2592705940).

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

2189784500 is a wasteful number, since it uses less digits than its factorization.

2189784500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4379588 (or 4379576 counting only the distinct ones).

The product of its (nonzero) digits is 161280, while the sum is 44.

The square root of 2189784500 is about 46795.1332939655. The cubic root of 2189784500 is about 1298.5752635866.

The spelling of 2189784500 in words is "two billion, one hundred eighty-nine million, seven hundred eighty-four thousand, five hundred".