18389008 has 40 divisors (see below), whose sum is σ = 39167136. Its totient is φ = 8294400.

The previous prime is 18388991. The next prime is 18389009. The reversal of 18389008 is 80098381.

It is not an unprimeable number, because it can be changed into a prime (18389009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28368 + ... + 29008.

Almost surely, 2^18389008 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 18389008, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19583568).

18389008 is an abundant number, since it is smaller than the sum of its proper divisors (20778128).

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

18389008 is a wasteful number, since it uses less digits than its factorization.

18389008 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 823 (or 817 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 37.

The square root of 18389008 is about 4288.2406648881. The cubic root of 18389008 is about 263.9486432087.

The spelling of 18389008 in words is "eighteen million, three hundred eighty-nine thousand, eight".