19945218 has 8 divisors (see below), whose sum is σ = 39890448. Its totient is φ = 6648404.

The previous prime is 19945207. The next prime is 19945241. The reversal of 19945218 is 81254991.

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

19945218 is an admirable number.

It is a Curzon 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, 1662096 + ... + 1662107.

It is an arithmetic number, because the mean of its divisors is an integer number (4986306).

Almost surely, 2^19945218 is an apocalyptic number.

19945218 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.

19945218 is a wasteful number, since it uses less digits than its factorization.

19945218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3324208.

The product of its digits is 25920, while the sum is 39.

The square root of 19945218 is about 4466.0069413291. The cubic root of 19945218 is about 271.1936996561.

The spelling of 19945218 in words is "nineteen million, nine hundred forty-five thousand, two hundred eighteen".