18017998 has 8 divisors (see below), whose sum is σ = 27240192. Its totient is φ = 8937936.

The previous prime is 18017981. The next prime is 18018017. The reversal of 18017998 is 89971081.

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, 35215 + ... + 35722.

It is an arithmetic number, because the mean of its divisors is an integer number (3405024).

Almost surely, 2^18017998 is an apocalyptic number.

18017998 is a deficient number, since it is larger than the sum of its proper divisors (9222194).

18017998 is a wasteful number, since it uses less digits than its factorization.

18017998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71066.

The product of its (nonzero) digits is 36288, while the sum is 43.

The square root of 18017998 is about 4244.7612418133. The cubic root of 18017998 is about 262.1614586642.

The spelling of 18017998 in words is "eighteen million, seventeen thousand, nine hundred ninety-eight".