12478609 has 12 divisors (see below), whose sum is σ = 14773108. Its totient is φ = 10470240.

The previous prime is 12478607. The next prime is 12478679. The reversal of 12478609 is 90687421.

12478609 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 2650384 + 9828225 = 1628^2 + 3135^2 .

It is not a de Polignac number, because 12478609 - 2¹ = 12478607 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12478607) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2394 + ... + 5539.

Almost surely, 2^12478609 is an apocalyptic number.

It is an amenable number.

12478609 is a deficient number, since it is larger than the sum of its proper divisors (2294499).

12478609 is a wasteful number, since it uses less digits than its factorization.

12478609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7968 (or 7957 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 12478609 is about 3532.5074663757. The cubic root of 12478609 is about 231.9469817909.

The spelling of 12478609 in words is "twelve million, four hundred seventy-eight thousand, six hundred nine".