12657609 has 12 divisors (see below), whose sum is σ = 18708976. Its totient is φ = 8241912.

The previous prime is 12657607. The next prime is 12657611. The reversal of 12657609 is 90675621.

It is an interprime number because it is at equal distance from previous prime (12657607) and next prime (12657611).

It is not a de Polignac number, because 12657609 - 2¹ = 12657607 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12657607) 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, 15967 + ... + 16740.

Almost surely, 2^12657609 is an apocalyptic number.

It is an amenable number.

12657609 is a deficient number, since it is larger than the sum of its proper divisors (6051367).

12657609 is a wasteful number, since it uses less digits than its factorization.

12657609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32756 (or 32753 counting only the distinct ones).

The product of its (nonzero) digits is 22680, while the sum is 36.

The square root of 12657609 is about 3557.7533641330. The cubic root of 12657609 is about 233.0507788410.

The spelling of 12657609 in words is "twelve million, six hundred fifty-seven thousand, six hundred nine".