1812287816 has 8 divisors (see below), whose sum is σ = 3398039670. Its totient is φ = 906143904.

The previous prime is 1812287801. The next prime is 1812287843. The reversal of 1812287816 is 6187822181.

It can be written as a sum of positive squares in only one way, i.e., 1573708900 + 238578916 = 39670^2 + 15446^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 113267981 + ... + 113267996.

Almost surely, 2^1812287816 is an apocalyptic number.

It is an amenable number.

1812287816 is a deficient number, since it is larger than the sum of its proper divisors (1585751854).

1812287816 is a wasteful number, since it uses less digits than its factorization.

1812287816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 226535983 (or 226535979 counting only the distinct ones).

The product of its digits is 86016, while the sum is 44.

The square root of 1812287816 is about 42570.9738671786. The cubic root of 1812287816 is about 1219.2021604278.

The spelling of 1812287816 in words is "one billion, eight hundred twelve million, two hundred eighty-seven thousand, eight hundred sixteen".