1812195963 has 16 divisors (see below), whose sum is σ = 2685415200. Its totient is φ = 1207824480.

The previous prime is 1812195947. The next prime is 1812195989. The reversal of 1812195963 is 3695912181.

It is not a de Polignac number, because 1812195963 - 2⁴ = 1812195947 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (1812195943) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 162573 + ... + 173361.

It is an arithmetic number, because the mean of its divisors is an integer number (167838450).

Almost surely, 2^1812195963 is an apocalyptic number.

1812195963 is a deficient number, since it is larger than the sum of its proper divisors (873219237).

1812195963 is a wasteful number, since it uses less digits than its factorization.

1812195963 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17019 (or 17013 counting only the distinct ones).

The product of its digits is 116640, while the sum is 45.

The square root of 1812195963 is about 42569.8950315831. The cubic root of 1812195963 is about 1219.1815622890.

The spelling of 1812195963 in words is "one billion, eight hundred twelve million, one hundred ninety-five thousand, nine hundred sixty-three".