198455993 has 2 divisors, whose sum is σ = 198455994. Its totient is φ = 198455992.

The previous prime is 198455989. The next prime is 198456053. The reversal of 198455993 is 399554891.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 195244729 + 3211264 = 13973^2 + 1792^2 .

It is a cyclic number.

It is not a de Polignac number, because 198455993 - 2² = 198455989 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (198455963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99227996 + 99227997.

It is an arithmetic number, because the mean of its divisors is an integer number (99227997).

Almost surely, 2^198455993 is an apocalyptic number.

It is an amenable number.

198455993 is a deficient number, since it is larger than the sum of its proper divisors (1).

198455993 is an equidigital number, since it uses as much as digits as its factorization.

198455993 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1749600, while the sum is 53.

The square root of 198455993 is about 14087.4409670458. The cubic root of 198455993 is about 583.2947570317.

The spelling of 198455993 in words is "one hundred ninety-eight million, four hundred fifty-five thousand, nine hundred ninety-three".