2638943843 has 4 divisors (see below), whose sum is σ = 2642574480. Its totient is φ = 2635313208.

The previous prime is 2638943819. The next prime is 2638943849. The reversal of 2638943843 is 3483498362.

2638943843 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3483498362 = 2 ⋅1741749181.

It is a cyclic number.

It is not a de Polignac number, because 2638943843 - 2¹² = 2638939747 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2638943791 and 2638943800.

It is not an unprimeable number, because it can be changed into a prime (2638943849) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1814228 + ... + 1815681.

It is an arithmetic number, because the mean of its divisors is an integer number (660643620).

Almost surely, 2^2638943843 is an apocalyptic number.

2638943843 is a deficient number, since it is larger than the sum of its proper divisors (3630637).

2638943843 is an equidigital number, since it uses as much as digits as its factorization.

2638943843 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3630636.

The product of its digits is 2985984, while the sum is 50.

The square root of 2638943843 is about 51370.6515726635. The cubic root of 2638943843 is about 1381.9003160689.

The spelling of 2638943843 in words is "two billion, six hundred thirty-eight million, nine hundred forty-three thousand, eight hundred forty-three".