12309605 has 16 divisors (see below), whose sum is σ = 18417024. Its totient is φ = 7673280.

The previous prime is 12309593. The next prime is 12309607. The reversal of 12309605 is 50690321.

It is not a de Polignac number, because 12309605 - 2⁴ = 12309589 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 (12309607) 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, 15602 + ... + 16371.

It is an arithmetic number, because the mean of its divisors is an integer number (1151064).

Almost surely, 2^12309605 is an apocalyptic number.

It is an amenable number.

12309605 is a deficient number, since it is larger than the sum of its proper divisors (6107419).

12309605 is a wasteful number, since it uses less digits than its factorization.

12309605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31996.

The product of its (nonzero) digits is 1620, while the sum is 26.

The square root of 12309605 is about 3508.5046672336. The cubic root of 12309605 is about 230.8950942607.

Adding to 12309605 its reverse (50690321), we get a palindrome (62999926).

The spelling of 12309605 in words is "twelve million, three hundred nine thousand, six hundred five".