198430957 has 2 divisors, whose sum is σ = 198430958. Its totient is φ = 198430956.

The previous prime is 198430951. The next prime is 198430961. The reversal of 198430957 is 759034891.

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., 175668516 + 22762441 = 13254^2 + 4771^2 .

It is a cyclic number.

It is not a de Polignac number, because 198430957 - 2⁷ = 198430829 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (198430951) 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, 99215478 + 99215479.

It is an arithmetic number, because the mean of its divisors is an integer number (99215479).

Almost surely, 2^198430957 is an apocalyptic number.

It is an amenable number.

198430957 is a deficient number, since it is larger than the sum of its proper divisors (1).

198430957 is an equidigital number, since it uses as much as digits as its factorization.

198430957 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 272160, while the sum is 46.

The square root of 198430957 is about 14086.5523461207. The cubic root of 198430957 is about 583.2702276950.

The spelling of 198430957 in words is "one hundred ninety-eight million, four hundred thirty thousand, nine hundred fifty-seven".