2188790394 has 16 divisors (see below), whose sum is σ = 5002949568. Its totient is φ = 625368672.

The previous prime is 2188790393. The next prime is 2188790407. The reversal of 2188790394 is 4930978812.

It is not an unprimeable number, because it can be changed into a prime (2188790393) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26056987 + ... + 26057070.

It is an arithmetic number, because the mean of its divisors is an integer number (312684348).

Almost surely, 2^2188790394 is an apocalyptic number.

2188790394 is an abundant number, since it is smaller than the sum of its proper divisors (2814159174).

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

2188790394 is a wasteful number, since it uses less digits than its factorization.

2188790394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52114069.

The product of its (nonzero) digits is 870912, while the sum is 51.

The square root of 2188790394 is about 46784.5101930115. The cubic root of 2188790394 is about 1298.3787272214.

The spelling of 2188790394 in words is "two billion, one hundred eighty-eight million, seven hundred ninety thousand, three hundred ninety-four".