2191694800 has 60 divisors (see below), whose sum is σ = 5276827936. Its totient is φ = 874800000.

The previous prime is 2191694759. The next prime is 2191694809. The reversal of 2191694800 is 84961912.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2191694809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 189175 + ... + 200425.

Almost surely, 2^2191694800 is an apocalyptic number.

2191694800 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2191694800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2638413968).

2191694800 is an abundant number, since it is smaller than the sum of its proper divisors (3085133136).

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

2191694800 is a wasteful number, since it uses less digits than its factorization.

2191694800 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11756 (or 11745 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 40.

The square root of 2191694800 is about 46815.5401549528. The cubic root of 2191694800 is about 1298.9527660795.

The spelling of 2191694800 in words is "two billion, one hundred ninety-one million, six hundred ninety-four thousand, eight hundred".