19997117 has 8 divisors (see below), whose sum is σ = 24198336. Its totient is φ = 16132032.

The previous prime is 19997099. The next prime is 19997119. The reversal of 19997117 is 71179991.

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

It is not a de Polignac number, because 19997117 - 2⁸ = 19996861 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 (19997119) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 83903 + ... + 84140.

It is an arithmetic number, because the mean of its divisors is an integer number (3024792).

Almost surely, 2^19997117 is an apocalyptic number.

19997117 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

19997117 is a deficient number, since it is larger than the sum of its proper divisors (4201219).

19997117 is a wasteful number, since it uses less digits than its factorization.

19997117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168067.

The product of its digits is 35721, while the sum is 44.

The square root of 19997117 is about 4471.8136141838. The cubic root of 19997117 is about 271.4287182561.

The spelling of 19997117 in words is "nineteen million, nine hundred ninety-seven thousand, one hundred seventeen".