2193991008 has 96 divisors (see below), whose sum is σ = 6347859840. Its totient is φ = 657960960.

The previous prime is 2193990991. The next prime is 2193991031. The reversal of 2193991008 is 8001993912.

It is a tau number, because it is divible by the number of its divisors (96).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 91723 + ... + 113141.

It is an arithmetic number, because the mean of its divisors is an integer number (66123540).

Almost surely, 2^2193991008 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 2193991008, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3173929920).

2193991008 is an abundant number, since it is smaller than the sum of its proper divisors (4153868832).

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

2193991008 is a wasteful number, since it uses less digits than its factorization.

2193991008 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21540 (or 21532 counting only the distinct ones).

The product of its (nonzero) digits is 34992, while the sum is 42.

The square root of 2193991008 is about 46840.0577284017. The cubic root of 2193991008 is about 1299.4062393013.

The spelling of 2193991008 in words is "two billion, one hundred ninety-three million, nine hundred ninety-one thousand, eight".