18019198 has 8 divisors (see below), whose sum is σ = 27056808. Its totient is φ = 9000264.

The previous prime is 18019159. The next prime is 18019223. The reversal of 18019198 is 89191081.

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 an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1936 + ... + 6307.

It is an arithmetic number, because the mean of its divisors is an integer number (3382101).

Almost surely, 2^18019198 is an apocalyptic number.

18019198 is a deficient number, since it is larger than the sum of its proper divisors (9037610).

18019198 is a wasteful number, since it uses less digits than its factorization.

18019198 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9338.

The product of its (nonzero) digits is 5184, while the sum is 37.

The square root of 18019198 is about 4244.9025901662. The cubic root of 18019198 is about 262.1672785258.

The spelling of 18019198 in words is "eighteen million, nineteen thousand, one hundred ninety-eight".