1855408868 has 12 divisors (see below), whose sum is σ = 3254907180. Its totient is φ = 925435392.

The previous prime is 1855408853. The next prime is 1855408871. The reversal of 1855408868 is 8688045581.

It can be written as a sum of positive squares in 2 ways, for example, as 962116324 + 893292544 = 31018^2 + 29888^2 .

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 3 ways as a sum of consecutive naturals, for example, 565421 + ... + 568692.

It is an arithmetic number, because the mean of its divisors is an integer number (271242265).

Almost surely, 2^1855408868 is an apocalyptic number.

It is an amenable number.

1855408868 is a deficient number, since it is larger than the sum of its proper divisors (1399498312).

1855408868 is a wasteful number, since it uses less digits than its factorization.

1855408868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1134526 (or 1134524 counting only the distinct ones).

The product of its (nonzero) digits is 2457600, while the sum is 53.

The square root of 1855408868 is about 43074.4572571727. The cubic root of 1855408868 is about 1228.7962462487.

The spelling of 1855408868 in words is "one billion, eight hundred fifty-five million, four hundred eight thousand, eight hundred sixty-eight".