2143971840 has 160 divisors (see below), whose sum is σ = 6920717760. Its totient is φ = 566165504.

The previous prime is 2143971719. The next prime is 2143971853. The reversal of 2143971840 is 481793412.

It is a tau number, because it is divible by the number of its divisors (160).

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, 820456 + ... + 823064.

It is an arithmetic number, because the mean of its divisors is an integer number (43254486).

Almost surely, 2^2143971840 is an apocalyptic number.

2143971840 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 2143971840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3460358880).

2143971840 is an abundant number, since it is smaller than the sum of its proper divisors (4776745920).

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

2143971840 is a wasteful number, since it uses less digits than its factorization.

2143971840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2742 (or 2726 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 39.

The square root of 2143971840 is about 46303.0435284766. The cubic root of 2143971840 is about 1289.4555000266.

The spelling of 2143971840 in words is "two billion, one hundred forty-three million, nine hundred seventy-one thousand, eight hundred forty".