2851239856 has 20 divisors (see below), whose sum is σ = 5548620312. Its totient is φ = 1419337856.

The previous prime is 2851239851. The next prime is 2851239889. The reversal of 2851239856 is 6589321582.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (2851239851) 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, 388885 + ... + 396148.

Almost surely, 2^2851239856 is an apocalyptic number.

It is an amenable number.

2851239856 is a deficient number, since it is larger than the sum of its proper divisors (2697380456).

2851239856 is a wasteful number, since it uses less digits than its factorization.

2851239856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 785268 (or 785262 counting only the distinct ones).

The product of its digits is 1036800, while the sum is 49.

The square root of 2851239856 is about 53397.0023128640. The cubic root of 2851239856 is about 1418.0055077791.

The spelling of 2851239856 in words is "two billion, eight hundred fifty-one million, two hundred thirty-nine thousand, eight hundred fifty-six".