12209123 has 4 divisors (see below), whose sum is σ = 12216240. Its totient is φ = 12202008.

The previous prime is 12209101. The next prime is 12209137. The reversal of 12209123 is 32190221.

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: 32190221 = 7 ⋅4598603.

It is a cyclic number.

It is not a de Polignac number, because 12209123 - 2¹⁰ = 12208099 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12209095 and 12209104.

It is not an unprimeable number, because it can be changed into a prime (12209023) 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, 773 + ... + 5001.

It is an arithmetic number, because the mean of its divisors is an integer number (3054060).

Almost surely, 2^12209123 is an apocalyptic number.

12209123 is a deficient number, since it is larger than the sum of its proper divisors (7117).

12209123 is an equidigital number, since it uses as much as digits as its factorization.

12209123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7116.

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 12209123 is about 3494.1555489131. The cubic root of 12209123 is about 230.2651196116.

Adding to 12209123 its reverse (32190221), we get a palindrome (44399344).

The spelling of 12209123 in words is "twelve million, two hundred nine thousand, one hundred twenty-three".