1809681100 has 54 divisors (see below), whose sum is σ = 4036317180. Its totient is φ = 704255040.

The previous prime is 1809681089. The next prime is 1809681103. The reversal of 1809681100 is 11869081.

It is not an unprimeable number, because it can be changed into a prime (1809681103) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 130291 + ... + 143509.

Almost surely, 2^1809681100 is an apocalyptic number.

1809681100 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 1809681100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2018158590).

1809681100 is an abundant number, since it is smaller than the sum of its proper divisors (2226636080).

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

1809681100 is a wasteful number, since it uses less digits than its factorization.

1809681100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13307 (or 13263 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 34.

The square root of 1809681100 is about 42540.3467310740. The cubic root of 1809681100 is about 1218.6173308139.

The spelling of 1809681100 in words is "one billion, eight hundred nine million, six hundred eighty-one thousand, one hundred".