12655689 has 4 divisors (see below), whose sum is σ = 16874256. Its totient is φ = 8437124.

The previous prime is 12655651. The next prime is 12655693. The reversal of 12655689 is 98655621.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 98655621 = 3 ⋅32885207.

It is a cyclic number.

It is not a de Polignac number, because 12655689 - 2⁷ = 12655561 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 12655689.

It is not an unprimeable number, because it can be changed into a prime (12655619) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2109279 + ... + 2109284.

It is an arithmetic number, because the mean of its divisors is an integer number (4218564).

Almost surely, 2^12655689 is an apocalyptic number.

It is an amenable number.

12655689 is a deficient number, since it is larger than the sum of its proper divisors (4218567).

12655689 is an equidigital number, since it uses as much as digits as its factorization.

12655689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4218566.

The product of its digits is 129600, while the sum is 42.

The square root of 12655689 is about 3557.4835206927. The cubic root of 12655689 is about 233.0389946217.

The spelling of 12655689 in words is "twelve million, six hundred fifty-five thousand, six hundred eighty-nine".