2173900000 has 72 divisors (see below), whose sum is σ = 5349735720. Its totient is φ = 869520000.

The previous prime is 2173899983. The next prime is 2173900009. The reversal of 2173900000 is 93712.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2173900009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 89131 + ... + 110869.

It is an arithmetic number, because the mean of its divisors is an integer number (74301885).

Almost surely, 2^2173900000 is an apocalyptic number.

2173900000 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 2173900000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2674867860).

2173900000 is an abundant number, since it is smaller than the sum of its proper divisors (3175835720).

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

2173900000 is an frugal number, since it uses more digits than its factorization.

2173900000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21774 (or 21746 counting only the distinct ones).

The product of its (nonzero) digits is 378, while the sum is 22.

The square root of 2173900000 is about 46625.1005360846. The cubic root of 2173900000 is about 1295.4277245256.

Adding to 2173900000 its reverse (93712), we get a palindrome (2173993712).

The spelling of 2173900000 in words is "two billion, one hundred seventy-three million, nine hundred thousand".