19998097 has 4 divisors (see below), whose sum is σ = 22854976. Its totient is φ = 17141220.

The previous prime is 19998047. The next prime is 19998149. The reversal of 19998097 is 79089991.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 79089991 = 2351 ⋅33641.

It is a cyclic number.

It is not a de Polignac number, because 19998097 - 2¹¹ = 19996049 is a prime.

It is a Duffinian number.

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 3 ways as a sum of consecutive naturals, for example, 1428429 + ... + 1428442.

It is an arithmetic number, because the mean of its divisors is an integer number (5713744).

Almost surely, 2^19998097 is an apocalyptic number.

It is an amenable number.

19998097 is a deficient number, since it is larger than the sum of its proper divisors (2856879).

19998097 is an equidigital number, since it uses as much as digits as its factorization.

19998097 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2856878.

The product of its (nonzero) digits is 367416, while the sum is 52.

The square root of 19998097 is about 4471.9231880702. The cubic root of 19998097 is about 271.4331521585.

The spelling of 19998097 in words is "nineteen million, nine hundred ninety-eight thousand, ninety-seven".