18218994 has 8 divisors (see below), whose sum is σ = 36438000. Its totient is φ = 6072996.

The previous prime is 18218983. The next prime is 18219001. The reversal of 18218994 is 49981281.

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

18218994 is an admirable number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1518244 + ... + 1518255.

It is an arithmetic number, because the mean of its divisors is an integer number (4554750).

Almost surely, 2^18218994 is an apocalyptic number.

18218994 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18218994 is a wasteful number, since it uses less digits than its factorization.

18218994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3036504.

The product of its digits is 41472, while the sum is 42.

The square root of 18218994 is about 4268.3713521670. The cubic root of 18218994 is about 263.1326851963.

The spelling of 18218994 in words is "eighteen million, two hundred eighteen thousand, nine hundred ninety-four".