19954218 has 32 divisors (see below), whose sum is σ = 42408000. Its totient is φ = 6241536.

The previous prime is 19954217. The next prime is 19954223. The reversal of 19954218 is 81245991.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (19954217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12108 + ... + 13656.

It is an arithmetic number, because the mean of its divisors is an integer number (1325250).

Almost surely, 2^19954218 is an apocalyptic number.

19954218 is an abundant number, since it is smaller than the sum of its proper divisors (22453782).

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

19954218 is a wasteful number, since it uses less digits than its factorization.

19954218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1686.

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

The square root of 19954218 is about 4467.0144391976. The cubic root of 19954218 is about 271.2344843072.

The spelling of 19954218 in words is "nineteen million, nine hundred fifty-four thousand, two hundred eighteen".