18438823488 has 112 divisors (see below), whose sum is σ = 50173128000. Its totient is φ = 5973884928.

The previous prime is 18438823369. The next prime is 18438823519. The reversal of 18438823488 is 88432883481.

It is a super-2 number, since 2×18438823488² (a number of 21 digits) contains 22 as substring.

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 999048 + ... + 1017336.

Almost surely, 2^18438823488 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18438823488, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25086564000).

18438823488 is an abundant number, since it is smaller than the sum of its proper divisors (31734304512).

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

18438823488 is a wasteful number, since it uses less digits than its factorization.

18438823488 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18452 (or 18442 counting only the distinct ones).

The product of its digits is 9437184, while the sum is 57.

The spelling of 18438823488 in words is "eighteen billion, four hundred thirty-eight million, eight hundred twenty-three thousand, four hundred eighty-eight".