18321898 has 8 divisors (see below), whose sum is σ = 31408992. Its totient is φ = 7852236.

The previous prime is 18321893. The next prime is 18321907. The reversal of 18321898 is 89812381.

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

It is an alternating number because its digits alternate between odd and even.

It is a self number, because there is not a number n which added to its sum of digits gives 18321898.

It is not an unprimeable number, because it can be changed into a prime (18321893) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 654340 + ... + 654367.

It is an arithmetic number, because the mean of its divisors is an integer number (3926124).

Almost surely, 2^18321898 is an apocalyptic number.

18321898 is a deficient number, since it is larger than the sum of its proper divisors (13087094).

18321898 is a wasteful number, since it uses less digits than its factorization.

18321898 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1308716.

The product of its digits is 27648, while the sum is 40.

The square root of 18321898 is about 4280.4086253534. The cubic root of 18321898 is about 263.6271615640.

The spelling of 18321898 in words is "eighteen million, three hundred twenty-one thousand, eight hundred ninety-eight".