199839688 has 8 divisors (see below), whose sum is σ = 374699430. Its totient is φ = 99919840.

The previous prime is 199839683. The next prime is 199839697. The reversal of 199839688 is 886938991.

It can be written as a sum of positive squares in only one way, i.e., 188293284 + 11546404 = 13722^2 + 3398^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-3 number, since 3×199839688³ (a number of 26 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (199839683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12489973 + ... + 12489988.

Almost surely, 2^199839688 is an apocalyptic number.

It is an amenable number.

199839688 is a deficient number, since it is larger than the sum of its proper divisors (174859742).

199839688 is a wasteful number, since it uses less digits than its factorization.

199839688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24979967 (or 24979963 counting only the distinct ones).

The product of its digits is 6718464, while the sum is 61.

The square root of 199839688 is about 14136.4666023727. The cubic root of 199839688 is about 584.6472541650.

The spelling of 199839688 in words is "one hundred ninety-nine million, eight hundred thirty-nine thousand, six hundred eighty-eight".