18238472144 has 40 divisors (see below), whose sum is σ = 36657237120. Its totient is φ = 8784172800.

The previous prime is 18238472143. The next prime is 18238472237. The reversal of 18238472144 is 44127483281.

It is a super-4 number, since 4×18238472144⁴ (a number of 42 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a junction number, because it is equal to n+sod(n) for n = 18238472095 and 18238472104.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18238472143) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 124142 + ... + 227789.

It is an arithmetic number, because the mean of its divisors is an integer number (916430928).

Almost surely, 2^18238472144 is an apocalyptic number.

It is an amenable number.

18238472144 is an abundant number, since it is smaller than the sum of its proper divisors (18418764976).

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

18238472144 is a wasteful number, since it uses less digits than its factorization.

18238472144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 352059 (or 352053 counting only the distinct ones).

The product of its digits is 344064, while the sum is 44.

The spelling of 18238472144 in words is "eighteen billion, two hundred thirty-eight million, four hundred seventy-two thousand, one hundred forty-four".