1812661300 has 18 divisors (see below), whose sum is σ = 3933475238. Its totient is φ = 725064480.

The previous prime is 1812661297. The next prime is 1812661337. The reversal of 1812661300 is 31662181.

It can be written as a sum of positive squares in 3 ways, for example, as 5731236 + 1806930064 = 2394^2 + 42508^2 .

It is a congruent number.

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 in 5 ways as a sum of consecutive naturals, for example, 9063207 + ... + 9063406.

Almost surely, 2^1812661300 is an apocalyptic number.

1812661300 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1812661300 is an abundant number, since it is smaller than the sum of its proper divisors (2120813938).

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

1812661300 is a wasteful number, since it uses less digits than its factorization.

1812661300 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18126627 (or 18126620 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 1812661300 is about 42575.3602450995. The cubic root of 1812661300 is about 1219.2859074682.

The spelling of 1812661300 in words is "one billion, eight hundred twelve million, six hundred sixty-one thousand, three hundred".