19998017 has 8 divisors (see below), whose sum is σ = 22473024. Its totient is φ = 17656848.

The previous prime is 19997993. The next prime is 19998029. The reversal of 19998017 is 71089991.

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

It is a cyclic number.

It is not a de Polignac number, because 19998017 - 2⁶ = 19997953 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19998047) 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, 33143 + ... + 33740.

It is an arithmetic number, because the mean of its divisors is an integer number (2809128).

Almost surely, 2^19998017 is an apocalyptic number.

It is an amenable number.

19998017 is a deficient number, since it is larger than the sum of its proper divisors (2475007).

19998017 is a wasteful number, since it uses less digits than its factorization.

19998017 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66919.

The product of its (nonzero) digits is 40824, while the sum is 44.

The square root of 19998017 is about 4471.9142433638. The cubic root of 19998017 is about 271.4327902128.

The spelling of 19998017 in words is "nineteen million, nine hundred ninety-eight thousand, seventeen".