19918218 has 8 divisors (see below), whose sum is σ = 39836448. Its totient is φ = 6639404.

The previous prime is 19918201. The next prime is 19918231. The reversal of 19918218 is 81281991.

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

19918218 is an admirable 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, 1659846 + ... + 1659857.

It is an arithmetic number, because the mean of its divisors is an integer number (4979556).

Almost surely, 2^19918218 is an apocalyptic number.

19918218 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.

19918218 is a wasteful number, since it uses less digits than its factorization.

19918218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3319708.

The product of its digits is 10368, while the sum is 39.

The square root of 19918218 is about 4462.9830830959. The cubic root of 19918218 is about 271.0712720408.

The spelling of 19918218 in words is "nineteen million, nine hundred eighteen thousand, two hundred eighteen".