18857981800 has 96 divisors (see below), whose sum is σ = 50712379200. Its totient is φ = 6387655680.

The previous prime is 18857981761. The next prime is 18857981809. The reversal of 18857981800 is 818975881.

It is not an unprimeable number, because it can be changed into a prime (18857981809) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 35056 + ... + 197344.

It is an arithmetic number, because the mean of its divisors is an integer number (528253950).

Almost surely, 2^18857981800 is an apocalyptic number.

18857981800 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 18857981800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25356189600).

18857981800 is an abundant number, since it is smaller than the sum of its proper divisors (31854397400).

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

18857981800 is a wasteful number, since it uses less digits than its factorization.

18857981800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162395 (or 162386 counting only the distinct ones).

The product of its (nonzero) digits is 1290240, while the sum is 55.

The spelling of 18857981800 in words is "eighteen billion, eight hundred fifty-seven million, nine hundred eighty-one thousand, eight hundred".