197873209 has 4 divisors (see below), whose sum is σ = 206476416. Its totient is φ = 189270004.

The previous prime is 197873191. The next prime is 197873213. The reversal of 197873209 is 902378791.

It is a happy number.

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: 902378791 = 197 ⋅4580603.

It is a cyclic number.

It is not a de Polignac number, because 197873209 - 2¹¹ = 197871161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (197873219) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4301569 + ... + 4301614.

It is an arithmetic number, because the mean of its divisors is an integer number (51619104).

Almost surely, 2^197873209 is an apocalyptic number.

It is an amenable number.

197873209 is a deficient number, since it is larger than the sum of its proper divisors (8603207).

197873209 is an equidigital number, since it uses as much as digits as its factorization.

197873209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8603206.

The product of its (nonzero) digits is 190512, while the sum is 46.

The square root of 197873209 is about 14066.7412359793. The cubic root of 197873209 is about 582.7232312570.

The spelling of 197873209 in words is "one hundred ninety-seven million, eight hundred seventy-three thousand, two hundred nine".