12669945 has 16 divisors (see below), whose sum is σ = 20475072. Its totient is φ = 6689600.

The previous prime is 12669929. The next prime is 12669949. The reversal of 12669945 is 54996621.

It is a happy number.

It is not a de Polignac number, because 12669945 - 2⁴ = 12669929 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 12669897 and 12669906.

It is not an unprimeable number, because it can be changed into a prime (12669949) 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 15 ways as a sum of consecutive naturals, for example, 2667 + ... + 5696.

It is an arithmetic number, because the mean of its divisors is an integer number (1279692).

Almost surely, 2^12669945 is an apocalyptic number.

12669945 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12669945 is a deficient number, since it is larger than the sum of its proper divisors (7805127).

12669945 is a wasteful number, since it uses less digits than its factorization.

12669945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8472.

The product of its digits is 116640, while the sum is 42.

The square root of 12669945 is about 3559.4866202867. The cubic root of 12669945 is about 233.1264640398.

It can be divided in two parts, 1266 and 9945, that added together give a palindrome (11211).

The spelling of 12669945 in words is "twelve million, six hundred sixty-nine thousand, nine hundred forty-five".