18889998 has 8 divisors (see below), whose sum is σ = 37780008. Its totient is φ = 6296664.

The previous prime is 18889993. The next prime is 18889999. The reversal of 18889998 is 89998881.

It is a sphenic number, since it is the product of 3 distinct primes.

18889998 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18889993) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1574161 + ... + 1574172.

It is an arithmetic number, because the mean of its divisors is an integer number (4722501).

Almost surely, 2^18889998 is an apocalyptic number.

18889998 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

18889998 is a wasteful number, since it uses less digits than its factorization.

18889998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3148338.

The product of its digits is 2985984, while the sum is 60.

The square root of 18889998 is about 4346.2625323374. The cubic root of 18889998 is about 266.3242037880.

The spelling of 18889998 in words is "eighteen million, eight hundred eighty-nine thousand, nine hundred ninety-eight".