18181128 has 64 divisors (see below), whose sum is σ = 53637120. Its totient is φ = 5025600.

The previous prime is 18181117. The next prime is 18181147. The reversal of 18181128 is 82118181.

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

It is a junction number, because it is equal to n+sod(n) for n = 18181095 and 18181104.

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, 3463 + ... + 6953.

It is an arithmetic number, because the mean of its divisors is an integer number (838080).

Almost surely, 2^18181128 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 18181128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26818560).

18181128 is an abundant number, since it is smaller than the sum of its proper divisors (35455992).

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

18181128 is a wasteful number, since it uses less digits than its factorization.

18181128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3538 (or 3534 counting only the distinct ones).

The product of its digits is 1024, while the sum is 30.

The square root of 18181128 is about 4263.9333953522. The cubic root of 18181128 is about 262.9502621514.

The spelling of 18181128 in words is "eighteen million, one hundred eighty-one thousand, one hundred twenty-eight".