198808705 has 4 divisors (see below), whose sum is σ = 238570452. Its totient is φ = 159046960.

The previous prime is 198808691. The next prime is 198808741. The reversal of 198808705 is 507808891.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 507808891 = 1381 ⋅367711.

It can be written as a sum of positive squares in 2 ways, for example, as 130233744 + 68574961 = 11412^2 + 8281^2 .

It is not a de Polignac number, because 198808705 - 2¹⁹ = 198284417 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19880866 + ... + 19880875.

It is an arithmetic number, because the mean of its divisors is an integer number (59642613).

Almost surely, 2^198808705 is an apocalyptic number.

It is an amenable number.

198808705 is a deficient number, since it is larger than the sum of its proper divisors (39761747).

198808705 is an equidigital number, since it uses as much as digits as its factorization.

198808705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39761746.

The product of its (nonzero) digits is 161280, while the sum is 46.

The square root of 198808705 is about 14099.9540779394. The cubic root of 198808705 is about 583.6401120136.

The spelling of 198808705 in words is "one hundred ninety-eight million, eight hundred eight thousand, seven hundred five".