198934397 has 2 divisors, whose sum is σ = 198934398. Its totient is φ = 198934396.

The previous prime is 198934367. The next prime is 198934399. The reversal of 198934397 is 793439891.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 192487876 + 6446521 = 13874^2 + 2539^2 .

It is an emirp because it is prime and its reverse (793439891) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 198934397 - 2²² = 194740093 is a prime.

Together with 198934399, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (198934399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99467198 + 99467199.

It is an arithmetic number, because the mean of its divisors is an integer number (99467199).

Almost surely, 2^198934397 is an apocalyptic number.

It is an amenable number.

198934397 is a deficient number, since it is larger than the sum of its proper divisors (1).

198934397 is an equidigital number, since it uses as much as digits as its factorization.

198934397 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1469664, while the sum is 53.

The square root of 198934397 is about 14104.4105513134. The cubic root of 198934397 is about 583.7630835548.

The spelling of 198934397 in words is "one hundred ninety-eight million, nine hundred thirty-four thousand, three hundred ninety-seven".