1800085812 has 48 divisors (see below), whose sum is σ = 4917316992. Its totient is φ = 501765120.

The previous prime is 1800085801. The next prime is 1800085813. The reversal of 1800085812 is 2185800081.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1800085813) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 257893 + ... + 264780.

It is an arithmetic number, because the mean of its divisors is an integer number (102444104).

Almost surely, 2^1800085812 is an apocalyptic number.

1800085812 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1800085812 is an abundant number, since it is smaller than the sum of its proper divisors (3117231180).

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

1800085812 is a wasteful number, since it uses less digits than its factorization.

1800085812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 522728 (or 522726 counting only the distinct ones).

The product of its (nonzero) digits is 5120, while the sum is 33.

The square root of 1800085812 is about 42427.4181632585. The cubic root of 1800085812 is about 1216.4597293970.

Adding to 1800085812 its reverse (2185800081), we get a palindrome (3985885893).

The spelling of 1800085812 in words is "one billion, eight hundred million, eighty-five thousand, eight hundred twelve".