12123309 has 16 divisors (see below), whose sum is σ = 18112320. Its totient is φ = 7148160.

The previous prime is 12123299. The next prime is 12123317. The reversal of 12123309 is 90332121.

It is a happy number.

It is not a de Polignac number, because 12123309 - 2⁸ = 12123053 is a prime.

It is a super-2 number, since 2×12123309² = 293949242218962, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12123359) 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, 3744 + ... + 6185.

It is an arithmetic number, because the mean of its divisors is an integer number (1132020).

Almost surely, 2^12123309 is an apocalyptic number.

It is an amenable number.

12123309 is a deficient number, since it is larger than the sum of its proper divisors (5989011).

12123309 is a wasteful number, since it uses less digits than its factorization.

12123309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9980.

The product of its (nonzero) digits is 324, while the sum is 21.

The square root of 12123309 is about 3481.8542473803. The cubic root of 12123309 is about 229.7243641974.

It can be divided in two parts, 12 and 123309, that added together give a palindrome (123321).

The spelling of 12123309 in words is "twelve million, one hundred twenty-three thousand, three hundred nine".