12103209 has 16 divisors (see below), whose sum is σ = 18875200. Its totient is φ = 7643808.

The previous prime is 12103207. The next prime is 12103213. The reversal of 12103209 is 90230121.

It is a happy number.

12103209 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12103209 - 2¹ = 12103207 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12103191 and 12103200.

It is not an unprimeable number, because it can be changed into a prime (12103207) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11284 + ... + 12309.

It is an arithmetic number, because the mean of its divisors is an integer number (1179700).

Almost surely, 2^12103209 is an apocalyptic number.

12103209 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

12103209 is a deficient number, since it is larger than the sum of its proper divisors (6771991).

12103209 is a wasteful number, since it uses less digits than its factorization.

12103209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23621 (or 23615 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

The square root of 12103209 is about 3478.9666569256. The cubic root of 12103209 is about 229.5973357892.

The spelling of 12103209 in words is "twelve million, one hundred three thousand, two hundred nine".