2781849843 has 6 divisors (see below), whose sum is σ = 4018227564. Its totient is φ = 1854566556.

The previous prime is 2781849841. The next prime is 2781849857. The reversal of 2781849843 is 3489481872.

It is a happy number.

It is not a de Polignac number, because 2781849843 - 2¹ = 2781849841 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2781849843.

It is not an unprimeable number, because it can be changed into a prime (2781849841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 154547205 + ... + 154547222.

It is an arithmetic number, because the mean of its divisors is an integer number (669704594).

Almost surely, 2^2781849843 is an apocalyptic number.

2781849843 is a deficient number, since it is larger than the sum of its proper divisors (1236377721).

2781849843 is a wasteful number, since it uses less digits than its factorization.

2781849843 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 309094433 (or 309094430 counting only the distinct ones).

The product of its digits is 3096576, while the sum is 54.

The square root of 2781849843 is about 52743.2445247730. The cubic root of 2781849843 is about 1406.4076760206.

The spelling of 2781849843 in words is "two billion, seven hundred eighty-one million, eight hundred forty-nine thousand, eight hundred forty-three".