198378959 has 2 divisors, whose sum is σ = 198378960. Its totient is φ = 198378958.

The previous prime is 198378923. The next prime is 198378997. The reversal of 198378959 is 959873891.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-198378959 is a prime.

It is a super-2 number, since 2×198378959² = 78708422747847362, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 198378898 and 198378907.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (198378359) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99189479 + 99189480.

It is an arithmetic number, because the mean of its divisors is an integer number (99189480).

Almost surely, 2^198378959 is an apocalyptic number.

198378959 is a deficient number, since it is larger than the sum of its proper divisors (1).

198378959 is an equidigital number, since it uses as much as digits as its factorization.

198378959 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4898880, while the sum is 59.

The square root of 198378959 is about 14084.7065642135. The cubic root of 198378959 is about 583.2192754052.

The spelling of 198378959 in words is "one hundred ninety-eight million, three hundred seventy-eight thousand, nine hundred fifty-nine".