198140399 has 2 divisors, whose sum is σ = 198140400. Its totient is φ = 198140398.

The previous prime is 198140381. The next prime is 198140401. The reversal of 198140399 is 993041891.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-198140399 is a prime.

It is a super-3 number, since 3×198140399³ (a number of 26 digits) contains 333 as substring.

Together with 198140401, 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 (198140329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99070199 + 99070200.

It is an arithmetic number, because the mean of its divisors is an integer number (99070200).

Almost surely, 2^198140399 is an apocalyptic number.

198140399 is a deficient number, since it is larger than the sum of its proper divisors (1).

198140399 is an equidigital number, since it uses as much as digits as its factorization.

198140399 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 69984, while the sum is 44.

The square root of 198140399 is about 14076.2352566302. The cubic root of 198140399 is about 582.9853987891.

It can be divided in two parts, 19 and 8140399, that added together give a palindrome (8140418).

The spelling of 198140399 in words is "one hundred ninety-eight million, one hundred forty thousand, three hundred ninety-nine".