196689 has 4 divisors (see below), whose sum is σ = 262256. Its totient is φ = 131124.

The previous prime is 196687. The next prime is 196699. The reversal of 196689 is 986691.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 986691 = 3 ⋅328897.

It is not a de Polignac number, because 196689 - 2¹ = 196687 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (196681) 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 in 3 ways as a sum of consecutive naturals, for example, 32779 + ... + 32784.

It is an arithmetic number, because the mean of its divisors is an integer number (65564).

196689 is a Friedman number, since it can be written as 9*9+8^(6-1)*6, using all its digits and the basic arithmetic operations.

2¹⁹⁶⁶⁸⁹ is an apocalyptic number.

It is an amenable number.

196689 is a deficient number, since it is larger than the sum of its proper divisors (65567).

196689 is an equidigital number, since it uses as much as digits as its factorization.

196689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65566.

The product of its digits is 23328, while the sum is 39.

The square root of 196689 is about 443.4963359488. The cubic root of 196689 is about 58.1558432675.

The spelling of 196689 in words is "one hundred ninety-six thousand, six hundred eighty-nine".