18799998 has 32 divisors (see below), whose sum is σ = 43497216. Its totient is φ = 5305728.

The previous prime is 18799997. The next prime is 18800003. The reversal of 18799998 is 89999781.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18799997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 790 + ... + 6182.

It is an arithmetic number, because the mean of its divisors is an integer number (1359288).

Almost surely, 2^18799998 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18799998, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21748608).

18799998 is an abundant number, since it is smaller than the sum of its proper divisors (24697218).

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

18799998 is a wasteful number, since it uses less digits than its factorization.

18799998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5488.

The product of its digits is 2939328, while the sum is 60.

The square root of 18799998 is about 4335.8964471030. The cubic root of 18799998 is about 265.9005696178.

The spelling of 18799998 in words is "eighteen million, seven hundred ninety-nine thousand, nine hundred ninety-eight".