12123605 has 24 divisors (see below), whose sum is σ = 16320696. Its totient is φ = 8588160.

The previous prime is 12123589. The next prime is 12123607. The reversal of 12123605 is 50632121.

It can be written as a sum of positive squares in 4 ways, for example, as 1456849 + 10666756 = 1207^2 + 3266^2 .

It is not a de Polignac number, because 12123605 - 2⁴ = 12123589 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12123607) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 170720 + ... + 170790.

It is an arithmetic number, because the mean of its divisors is an integer number (680029).

Almost surely, 2^12123605 is an apocalyptic number.

It is an amenable number.

12123605 is a deficient number, since it is larger than the sum of its proper divisors (4197091).

12123605 is an equidigital number, since it uses as much as digits as its factorization.

12123605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 197 (or 126 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 12123605 is about 3481.8967532079. The cubic root of 12123605 is about 229.7262338151.

Adding to 12123605 its reverse (50632121), we get a palindrome (62755726).

The spelling of 12123605 in words is "twelve million, one hundred twenty-three thousand, six hundred five".