1855991992 has 16 divisors (see below), whose sum is σ = 3631289040. Its totient is φ = 887648256.

The previous prime is 1855991989. The next prime is 1855991999. The reversal of 1855991992 is 2991995581.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1855991999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5043273 + ... + 5043640.

It is an arithmetic number, because the mean of its divisors is an integer number (226955565).

Almost surely, 2^1855991992 is an apocalyptic number.

It is an amenable number.

1855991992 is a deficient number, since it is larger than the sum of its proper divisors (1775297048).

1855991992 is a wasteful number, since it uses less digits than its factorization.

1855991992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10086942 (or 10086938 counting only the distinct ones).

The product of its digits is 2624400, while the sum is 58.

The square root of 1855991992 is about 43081.2255164590. The cubic root of 1855991992 is about 1228.9249628068.

The spelling of 1855991992 in words is "one billion, eight hundred fifty-five million, nine hundred ninety-one thousand, nine hundred ninety-two".