12945609 has 16 divisors (see below), whose sum is σ = 19362240. Its totient is φ = 8547840.

The previous prime is 12945607. The next prime is 12945613. The reversal of 12945609 is 90654921.

12945609 is a `hidden beast` number, since 1 + 2 + 9 + 45 + 609 = 666.

It is not a de Polignac number, because 12945609 - 2¹ = 12945607 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12945607) 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, 649 + ... + 5129.

It is an arithmetic number, because the mean of its divisors is an integer number (1210140).

Almost surely, 2^12945609 is an apocalyptic number.

It is an amenable number.

12945609 is a deficient number, since it is larger than the sum of its proper divisors (6416631).

12945609 is a wasteful number, since it uses less digits than its factorization.

12945609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4597 (or 4591 counting only the distinct ones).

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

The square root of 12945609 is about 3598.0006948304. Note that the first 3 decimals coincide. The cubic root of 12945609 is about 234.8050835839.

It can be divided in two parts, 1294 and 5609, that added together give a triangular number (6903 = T₁₁₇).

The spelling of 12945609 in words is "twelve million, nine hundred forty-five thousand, six hundred nine".