1812811892 has 12 divisors (see below), whose sum is σ = 3258162180. Its totient is φ = 881908416.

The previous prime is 1812811873. The next prime is 1812811901. The reversal of 1812811892 is 2981182181.

It can be written as a sum of positive squares in 2 ways, for example, as 667395556 + 1145416336 = 25834^2 + 33844^2 .

It is a congruent number.

It is an unprimeable number.

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, 6124217 + ... + 6124512.

It is an arithmetic number, because the mean of its divisors is an integer number (271513515).

Almost surely, 2^1812811892 is an apocalyptic number.

It is an amenable number.

1812811892 is a deficient number, since it is larger than the sum of its proper divisors (1445350288).

1812811892 is a wasteful number, since it uses less digits than its factorization.

1812811892 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12248770 (or 12248768 counting only the distinct ones).

The product of its digits is 18432, while the sum is 41.

The square root of 1812811892 is about 42577.1287430235. The cubic root of 1812811892 is about 1219.3196717497.

The spelling of 1812811892 in words is "one billion, eight hundred twelve million, eight hundred eleven thousand, eight hundred ninety-two".