196645 has 8 divisors (see below), whose sum is σ = 239904. Its totient is φ = 154704.

The previous prime is 196643. The next prime is 196657. The reversal of 196645 is 546691.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 196645 - 2¹ = 196643 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (196643) 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 7 ways as a sum of consecutive naturals, for example, 42 + ... + 628.

It is an arithmetic number, because the mean of its divisors is an integer number (29988).

196645 is a Friedman number, since it can be written as 5*(6*(9^4-6)-1), using all its digits and the basic arithmetic operations.

2¹⁹⁶⁶⁴⁵ is an apocalyptic number.

It is an amenable number.

196645 is a deficient number, since it is larger than the sum of its proper divisors (43259).

196645 is an equidigital number, since it uses as much as digits as its factorization.

196645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 659.

The product of its digits is 6480, while the sum is 31.

The square root of 196645 is about 443.4467273529. The cubic root of 196645 is about 58.1515063906.

It can be divided in two parts, 196 and 645, that added together give a square (841 = 29²).

The spelling of 196645 in words is "one hundred ninety-six thousand, six hundred forty-five".