1812345500 has 96 divisors (see below), whose sum is σ = 4543838208. Its totient is φ = 618600000.

The previous prime is 1812345497. The next prime is 1812345541. The reversal of 1812345500 is 55432181.

It is a super-2 number, since 2×1812345500² = 6569192422740500000, which contains 22 as substring.

It is a congruent number.

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 31 ways as a sum of consecutive naturals, for example, 877469 + ... + 879531.

It is an arithmetic number, because the mean of its divisors is an integer number (47331648).

Almost surely, 2^1812345500 is an apocalyptic number.

1812345500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1812345500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2271919104).

1812345500 is an abundant number, since it is smaller than the sum of its proper divisors (2731492708).

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

1812345500 is a wasteful number, since it uses less digits than its factorization.

1812345500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2340 (or 2328 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 29.

The square root of 1812345500 is about 42571.6513656682. The cubic root of 1812345500 is about 1219.2150957741.

Adding to 1812345500 its reverse (55432181), we get a palindrome (1867777681).

The spelling of 1812345500 in words is "one billion, eight hundred twelve million, three hundred forty-five thousand, five hundred".