198878863 has 2 divisors, whose sum is σ = 198878864. Its totient is φ = 198878862.

The previous prime is 198878851. The next prime is 198878879. The reversal of 198878863 is 368878891.

It is a weak prime.

It is an emirp because it is prime and its reverse (368878891) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-198878863 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 198878798 and 198878807.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (198873863) 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, 99439431 + 99439432.

It is an arithmetic number, because the mean of its divisors is an integer number (99439432).

Almost surely, 2^198878863 is an apocalyptic number.

198878863 is a deficient number, since it is larger than the sum of its proper divisors (1).

198878863 is an equidigital number, since it uses as much as digits as its factorization.

198878863 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4644864, while the sum is 58.

The square root of 198878863 is about 14102.4417389330. The cubic root of 198878863 is about 583.7087579133.

The spelling of 198878863 in words is "one hundred ninety-eight million, eight hundred seventy-eight thousand, eight hundred sixty-three".