2781123838 has 16 divisors (see below), whose sum is σ = 4347049680. Its totient is φ = 1332807616.

The previous prime is 2781123827. The next prime is 2781123859. The reversal of 2781123838 is 8383211872.

It is a junction number, because it is equal to n+sod(n) for n = 2781123794 and 2781123803.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 167056 + ... + 182947.

It is an arithmetic number, because the mean of its divisors is an integer number (271690605).

Almost surely, 2^2781123838 is an apocalyptic number.

2781123838 is a deficient number, since it is larger than the sum of its proper divisors (1565925842).

2781123838 is a wasteful number, since it uses less digits than its factorization.

2781123838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 350171.

The product of its digits is 129024, while the sum is 43.

The square root of 2781123838 is about 52736.3616302831. The cubic root of 2781123838 is about 1406.2853176500.

The spelling of 2781123838 in words is "two billion, seven hundred eighty-one million, one hundred twenty-three thousand, eight hundred thirty-eight".