199684 has 6 divisors (see below), whose sum is σ = 349454. Its totient is φ = 99840.

The previous prime is 199679. The next prime is 199687. The reversal of 199684 is 486991.

It can be written as a sum of positive squares in only one way, i.e., 193600 + 6084 = 440^2 + 78^2 .

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (199687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24957 + ... + 24964.

2¹⁹⁹⁶⁸⁴ is an apocalyptic number.

It is an amenable number.

199684 is a deficient number, since it is larger than the sum of its proper divisors (149770).

199684 is a wasteful number, since it uses less digits than its factorization.

199684 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49925 (or 49923 counting only the distinct ones).

The product of its digits is 15552, while the sum is 37.

The square root of 199684 is about 446.8601570962. The cubic root of 199684 is about 58.4495388753.

It can be divided in two parts, 1996 and 84, that added together give a triangular number (2080 = T₆₄).

The spelling of 199684 in words is "one hundred ninety-nine thousand, six hundred eighty-four".