2138873472 has 128 divisors (see below), whose sum is σ = 6645096000. Its totient is φ = 675412992.

The previous prime is 2138873461. The next prime is 2138873497. The reversal of 2138873472 is 2743788312.

It is a tau number, because it is divible by the number of its divisors (128).

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, 49378 + ... + 81950.

Almost surely, 2^2138873472 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 2138873472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3322548000).

2138873472 is an abundant number, since it is smaller than the sum of its proper divisors (4506222528).

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

2138873472 is a wasteful number, since it uses less digits than its factorization.

2138873472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32615 (or 32597 counting only the distinct ones).

The product of its digits is 451584, while the sum is 45.

The square root of 2138873472 is about 46247.9564089052. The cubic root of 2138873472 is about 1288.4325797751.

The spelling of 2138873472 in words is "two billion, one hundred thirty-eight million, eight hundred seventy-three thousand, four hundred seventy-two".