1812320370 has 144 divisors (see below), whose sum is σ = 5572029528. Its totient is φ = 407393280.

The previous prime is 1812320327. The next prime is 1812320371. The reversal of 1812320370 is 730232181.

It can be written as a sum of positive squares in 4 ways, for example, as 951660801 + 860659569 = 30849^2 + 29337^2 .

It is not an unprimeable number, because it can be changed into a prime (1812320371) by changing a digit.

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 71 ways as a sum of consecutive naturals, for example, 265642 + ... + 272378.

Almost surely, 2^1812320370 is an apocalyptic number.

1812320370 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1812320370, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2786014764).

1812320370 is an abundant number, since it is smaller than the sum of its proper divisors (3759709158).

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

1812320370 is a wasteful number, since it uses less digits than its factorization.

1812320370 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6825 (or 6815 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 1812320370 is about 42571.3562151830. The cubic root of 1812320370 is about 1219.2094605320.

The spelling of 1812320370 in words is "one billion, eight hundred twelve million, three hundred twenty thousand, three hundred seventy".