198712705 has 4 divisors (see below), whose sum is σ = 238455252. Its totient is φ = 158970160.

The previous prime is 198712699. The next prime is 198712739. The reversal of 198712705 is 507217891.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 123387664 + 75325041 = 11108^2 + 8679^2 .

It is not a de Polignac number, because 198712705 - 2¹¹ = 198710657 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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, 19871266 + ... + 19871275.

It is an arithmetic number, because the mean of its divisors is an integer number (59613813).

Almost surely, 2^198712705 is an apocalyptic number.

It is an amenable number.

198712705 is a deficient number, since it is larger than the sum of its proper divisors (39742547).

198712705 is an equidigital number, since it uses as much as digits as its factorization.

198712705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39742546.

The product of its (nonzero) digits is 35280, while the sum is 40.

The square root of 198712705 is about 14096.5494004739. The cubic root of 198712705 is about 583.5461549077.

The spelling of 198712705 in words is "one hundred ninety-eight million, seven hundred twelve thousand, seven hundred five".