199998706 has 4 divisors (see below), whose sum is σ = 299998062. Its totient is φ = 99999352.

The previous prime is 199998661. The next prime is 199998707. The reversal of 199998706 is 607899991.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 607899991 = 17 ⋅35758823.

It can be written as a sum of positive squares in only one way, i.e., 151068681 + 48930025 = 12291^2 + 6995^2 .

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (199998707) 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, 49999675 + ... + 49999678.

Almost surely, 2^199998706 is an apocalyptic number.

199998706 is a deficient number, since it is larger than the sum of its proper divisors (99999356).

199998706 is an equidigital number, since it uses as much as digits as its factorization.

199998706 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99999355.

The product of its (nonzero) digits is 2204496, while the sum is 58.

The square root of 199998706 is about 14142.0898738482. The cubic root of 199998706 is about 584.8022864135.

It can be divided in two parts, 199998 and 706, that added together give a square (200704 = 448²).

The spelling of 199998706 in words is "one hundred ninety-nine million, nine hundred ninety-eight thousand, seven hundred six".