2129443328 has 80 divisors (see below), whose sum is σ = 4385109960. Its totient is φ = 1032585216.

The previous prime is 2129443243. The next prime is 2129443331. The reversal of 2129443328 is 8233449212.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 2113057024 + 16386304 = 45968^2 + 4048^2 .

It is a junction number, because it is equal to n+sod(n) for n = 2129443291 and 2129443300.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2631788 + ... + 2632596.

Almost surely, 2^2129443328 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 2129443328, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2192554980).

2129443328 is an abundant number, since it is smaller than the sum of its proper divisors (2255666632).

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

2129443328 is an frugal number, since it uses more digits than its factorization.

2129443328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 977 (or 961 counting only the distinct ones).

The product of its digits is 82944, while the sum is 38.

The square root of 2129443328 is about 46145.8917781421. The cubic root of 2129443328 is about 1286.5362536469.

The spelling of 2129443328 in words is "two billion, one hundred twenty-nine million, four hundred forty-three thousand, three hundred twenty-eight".