19668117 has 8 divisors (see below), whose sum is σ = 29970496. Its totient is φ = 11238912.

The previous prime is 19668107. The next prime is 19668139. The reversal of 19668117 is 71186691.

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

It is not a de Polignac number, because 19668117 - 2¹⁴ = 19651733 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19668107) 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 7 ways as a sum of consecutive naturals, for example, 468268 + ... + 468309.

It is an arithmetic number, because the mean of its divisors is an integer number (3746312).

Almost surely, 2^19668117 is an apocalyptic number.

It is an amenable number.

19668117 is a deficient number, since it is larger than the sum of its proper divisors (10302379).

19668117 is an equidigital number, since it uses as much as digits as its factorization.

19668117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 936587.

The product of its digits is 18144, while the sum is 39.

The square root of 19668117 is about 4434.8750827955. The cubic root of 19668117 is about 269.9319307144.

The spelling of 19668117 in words is "nineteen million, six hundred sixty-eight thousand, one hundred seventeen".