198393389 has 2 divisors, whose sum is σ = 198393390. Its totient is φ = 198393388.

The previous prime is 198393367. The next prime is 198393427. The reversal of 198393389 is 983393891.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 198330889 + 62500 = 14083^2 + 250^2 .

It is a cyclic number.

It is not a de Polignac number, because 198393389 - 2¹² = 198389293 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 198393389.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (198393329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99196694 + 99196695.

It is an arithmetic number, because the mean of its divisors is an integer number (99196695).

Almost surely, 2^198393389 is an apocalyptic number.

It is an amenable number.

198393389 is a deficient number, since it is larger than the sum of its proper divisors (1).

198393389 is an equidigital number, since it uses as much as digits as its factorization.

198393389 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1259712, while the sum is 53.

The square root of 198393389 is about 14085.2188126419. The cubic root of 198393389 is about 583.2334161019.

The spelling of 198393389 in words is "one hundred ninety-eight million, three hundred ninety-three thousand, three hundred eighty-nine".