199829986 has 4 divisors (see below), whose sum is σ = 299744982. Its totient is φ = 99914992.

The previous prime is 199829983. The next prime is 199830047. The reversal of 199829986 is 689928991.

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

It can be written as a sum of positive squares in only one way, i.e., 196700625 + 3129361 = 14025^2 + 1769^2 .

It is not an unprimeable number, because it can be changed into a prime (199829983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49957495 + ... + 49957498.

Almost surely, 2^199829986 is an apocalyptic number.

199829986 is a deficient number, since it is larger than the sum of its proper divisors (99914996).

199829986 is an equidigital number, since it uses as much as digits as its factorization.

199829986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99914995.

The product of its digits is 5038848, while the sum is 61.

The square root of 199829986 is about 14136.1234431509. The cubic root of 199829986 is about 584.6377926820.

The spelling of 199829986 in words is "one hundred ninety-nine million, eight hundred twenty-nine thousand, nine hundred eighty-six".