18389198 has 8 divisors (see below), whose sum is σ = 28104408. Its totient is φ = 9021064.

The previous prime is 18389191. The next prime is 18389221. The reversal of 18389198 is 89198381.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18389191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 86636 + ... + 86847.

It is an arithmetic number, because the mean of its divisors is an integer number (3513051).

Almost surely, 2^18389198 is an apocalyptic number.

18389198 is a deficient number, since it is larger than the sum of its proper divisors (9715210).

18389198 is a wasteful number, since it uses less digits than its factorization.

18389198 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173538.

The product of its digits is 124416, while the sum is 47.

The square root of 18389198 is about 4288.2628184383. The cubic root of 18389198 is about 263.9495522675.

The spelling of 18389198 in words is "eighteen million, three hundred eighty-nine thousand, one hundred ninety-eight".