18234439900 has 72 divisors (see below), whose sum is σ = 40676990256. Its totient is φ = 7089868800.

The previous prime is 18234439879. The next prime is 18234439903. The reversal of 18234439900 is 993443281.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18234439903) 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, 5811132 + ... + 5814268.

It is an arithmetic number, because the mean of its divisors is an integer number (564958198).

Almost surely, 2^18234439900 is an apocalyptic number.

18234439900 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 18234439900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20338495128).

18234439900 is an abundant number, since it is smaller than the sum of its proper divisors (22442550356).

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

18234439900 is a wasteful number, since it uses less digits than its factorization.

18234439900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4759 (or 4752 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 43.

The spelling of 18234439900 in words is "eighteen billion, two hundred thirty-four million, four hundred thirty-nine thousand, nine hundred".