197209 has 4 divisors (see below), whose sum is σ = 198400. Its totient is φ = 196020.

The previous prime is 197207. The next prime is 197221. The reversal of 197209 is 902791.

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 a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 197209 - 2¹ = 197207 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (197203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 297 + ... + 694.

It is an arithmetic number, because the mean of its divisors is an integer number (49600).

2¹⁹⁷²⁰⁹ is an apocalyptic number.

It is an amenable number.

197209 is a deficient number, since it is larger than the sum of its proper divisors (1191).

197209 is an equidigital number, since it uses as much as digits as its factorization.

197209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1190.

The product of its (nonzero) digits is 1134, while the sum is 28.

The square root of 197209 is about 444.0821995982. The cubic root of 197209 is about 58.2070483467.

It can be divided in two parts, 197 and 209, that added together give a triangular number (406 = T₂₈).

The spelling of 197209 in words is "one hundred ninety-seven thousand, two hundred nine".