12198209 has 4 divisors (see below), whose sum is σ = 12840240. Its totient is φ = 11556180.

The previous prime is 12198161. The next prime is 12198217. The reversal of 12198209 is 90289121.

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.

It is a de Polignac number, because none of the positive numbers 2^k-12198209 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12198229) 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, 320987 + ... + 321024.

It is an arithmetic number, because the mean of its divisors is an integer number (3210060).

Almost surely, 2^12198209 is an apocalyptic number.

12198209 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

12198209 is a deficient number, since it is larger than the sum of its proper divisors (642031).

12198209 is an equidigital number, since it uses as much as digits as its factorization.

12198209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 642030.

The product of its (nonzero) digits is 2592, while the sum is 32.

The square root of 12198209 is about 3492.5934490003. The cubic root of 12198209 is about 230.1964861608.

The spelling of 12198209 in words is "twelve million, one hundred ninety-eight thousand, two hundred nine".