198142397 has 2 divisors, whose sum is σ = 198142398. Its totient is φ = 198142396.

The previous prime is 198142339. The next prime is 198142411. The reversal of 198142397 is 793241891.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 196728676 + 1413721 = 14026^2 + 1189^2 .

It is a cyclic number.

It is not a de Polignac number, because 198142397 - 2¹² = 198138301 is a prime.

It is a super-3 number, since 3×198142397³ (a number of 26 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (198142097) 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, 99071198 + 99071199.

It is an arithmetic number, because the mean of its divisors is an integer number (99071199).

Almost surely, 2^198142397 is an apocalyptic number.

It is an amenable number.

198142397 is a deficient number, since it is larger than the sum of its proper divisors (1).

198142397 is an equidigital number, since it uses as much as digits as its factorization.

198142397 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 108864, while the sum is 44.

The square root of 198142397 is about 14076.3062271322. The cubic root of 198142397 is about 582.9873583439.

The spelling of 198142397 in words is "one hundred ninety-eight million, one hundred forty-two thousand, three hundred ninety-seven".