196409 has 4 divisors (see below), whose sum is σ = 197604. Its totient is φ = 195216.

The previous prime is 196387. The next prime is 196429. The reversal of 196409 is 904691.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 904691 = 61 ⋅14831.

It can be written as a sum of positive squares in 2 ways, for example, as 183184 + 13225 = 428^2 + 115^2 .

It is a cyclic number.

It is not a de Polignac number, because 196409 - 2¹⁶ = 130873 is a prime.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 196409.

It is not an unprimeable number, because it can be changed into a prime (196429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 302 + ... + 695.

It is an arithmetic number, because the mean of its divisors is an integer number (49401).

2¹⁹⁶⁴⁰⁹ is an apocalyptic number.

It is an amenable number.

196409 is a deficient number, since it is larger than the sum of its proper divisors (1195).

196409 is an equidigital number, since it uses as much as digits as its factorization.

196409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1194.

The product of its (nonzero) digits is 1944, while the sum is 29.

The square root of 196409 is about 443.1805501147. The cubic root of 196409 is about 58.1282339126.

It can be divided in two parts, 19 and 6409, that multiplied together give a triangular number (121771 = T₄₉₃).

The spelling of 196409 in words is "one hundred ninety-six thousand, four hundred nine".