198420449 has 2 divisors, whose sum is σ = 198420450. Its totient is φ = 198420448.

The previous prime is 198420437. The next prime is 198420457. The reversal of 198420449 is 944024891.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 152275600 + 46144849 = 12340^2 + 6793^2 .

It is a cyclic number.

It is not a de Polignac number, because 198420449 - 2¹² = 198416353 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (198420749) 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, 99210224 + 99210225.

It is an arithmetic number, because the mean of its divisors is an integer number (99210225).

Almost surely, 2^198420449 is an apocalyptic number.

It is an amenable number.

198420449 is a deficient number, since it is larger than the sum of its proper divisors (1).

198420449 is an equidigital number, since it uses as much as digits as its factorization.

198420449 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 82944, while the sum is 41.

The square root of 198420449 is about 14086.1793613456. The cubic root of 198420449 is about 583.2599317347.

The spelling of 198420449 in words is "one hundred ninety-eight million, four hundred twenty thousand, four hundred forty-nine".