1815210000 has 400 divisors, whose sum is σ = 6670614720. Its totient is φ = 478224000.

The previous prime is 1815209999. The next prime is 1815210013. The reversal of 1815210000 is 125181.

It is a tau number, because it is divible by the number of its divisors (400).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 21869959 + ... + 21870041.

Almost surely, 2^1815210000 is an apocalyptic number.

1815210000 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 1815210000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3335307360).

1815210000 is an abundant number, since it is smaller than the sum of its proper divisors (4855404720).

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

1815210000 is an frugal number, since it uses more digits than its factorization.

1815210000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132 (or 93 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 18.

The square root of 1815210000 is about 42605.2813627607. The cubic root of 1815210000 is about 1219.8571005251.

Adding to 1815210000 its reverse (125181), we get a palindrome (1815335181).

The spelling of 1815210000 in words is "one billion, eight hundred fifteen million, two hundred ten thousand".