18327998 has 16 divisors (see below), whose sum is σ = 29684256. Its totient is φ = 8436960.

The previous prime is 18327973. The next prime is 18328003. The reversal of 18327998 is 89972381.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13415 + ... + 14717.

It is an arithmetic number, because the mean of its divisors is an integer number (1855266).

Almost surely, 2^18327998 is an apocalyptic number.

18327998 is a deficient number, since it is larger than the sum of its proper divisors (11356258).

18327998 is a wasteful number, since it uses less digits than its factorization.

18327998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1859.

The product of its digits is 217728, while the sum is 47.

The square root of 18327998 is about 4281.1211148483. The cubic root of 18327998 is about 263.6564152154.

The spelling of 18327998 in words is "eighteen million, three hundred twenty-seven thousand, nine hundred ninety-eight".