12405969 has 6 divisors (see below), whose sum is σ = 17919746. Its totient is φ = 8270640.

The previous prime is 12405961. The next prime is 12406013. The reversal of 12405969 is 96950421.

It can be written as a sum of positive squares in only one way, i.e., 8485569 + 3920400 = 2913^2 + 1980^2 .

It is not a de Polignac number, because 12405969 - 2³ = 12405961 is a prime.

It is a super-2 number, since 2×12405969² = 307816133657922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12405961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 689212 + ... + 689229.

Almost surely, 2^12405969 is an apocalyptic number.

It is an amenable number.

12405969 is a deficient number, since it is larger than the sum of its proper divisors (5513777).

12405969 is a wasteful number, since it uses less digits than its factorization.

12405969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1378447 (or 1378444 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 36.

The square root of 12405969 is about 3522.2108114081. The cubic root of 12405969 is about 231.4960386940.

The spelling of 12405969 in words is "twelve million, four hundred five thousand, nine hundred sixty-nine".