2191899888 has 240 divisors, whose sum is σ = 6831784960. Its totient is φ = 653184000.

The previous prime is 2191899887. The next prime is 2191899901. The reversal of 2191899888 is 8889981912.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2191899881) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3646788 + ... + 3647388.

Almost surely, 2^2191899888 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2191899888, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3415892480).

2191899888 is an abundant number, since it is smaller than the sum of its proper divisors (4639885072).

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

2191899888 is a wasteful number, since it uses less digits than its factorization.

2191899888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 708 (or 699 counting only the distinct ones).

The product of its digits is 5971968, while the sum is 63.

The square root of 2191899888 is about 46817.7304874980. The cubic root of 2191899888 is about 1298.9932813489.

The spelling of 2191899888 in words is "two billion, one hundred ninety-one million, eight hundred ninety-nine thousand, eight hundred eighty-eight".