19909118 has 8 divisors (see below), whose sum is σ = 30092040. Its totient is φ = 9878440.

The previous prime is 19909111. The next prime is 19909121. The reversal of 19909118 is 81190991.

It is a happy number.

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

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19909111) by changing a digit.

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, 37733 + ... + 38256.

It is an arithmetic number, because the mean of its divisors is an integer number (3761505).

Almost surely, 2^19909118 is an apocalyptic number.

19909118 is a deficient number, since it is larger than the sum of its proper divisors (10182922).

19909118 is a wasteful number, since it uses less digits than its factorization.

19909118 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76122.

The product of its (nonzero) digits is 5832, while the sum is 38.

The square root of 19909118 is about 4461.9634691467. The cubic root of 19909118 is about 271.0299844729.

The spelling of 19909118 in words is "nineteen million, nine hundred nine thousand, one hundred eighteen".