1812085164 has 36 divisors (see below), whose sum is σ = 4610897200. Its totient is φ = 600026400.

The previous prime is 1812085151. The next prime is 1812085189. The reversal of 1812085164 is 4615802181.

1812085164 is a `hidden beast` number, since 18 + 120 + 8 + 516 + 4 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

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 11 ways as a sum of consecutive naturals, for example, 161239 + ... + 172110.

Almost surely, 2^1812085164 is an apocalyptic number.

It is an amenable number.

1812085164 is an abundant number, since it is smaller than the sum of its proper divisors (2798812036).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1812085164 is a wasteful number, since it uses less digits than its factorization.

1812085164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 333510 (or 333505 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 36.

The square root of 1812085164 is about 42568.5936342746. The cubic root of 1812085164 is about 1219.1567145621.

The spelling of 1812085164 in words is "one billion, eight hundred twelve million, eighty-five thousand, one hundred sixty-four".