12657689 has 12 divisors (see below), whose sum is σ = 14113428. Its totient is φ = 11341440.

The previous prime is 12657637. The next prime is 12657691. The reversal of 12657689 is 98675621.

It can be written as a sum of positive squares in 2 ways, for example, as 8952064 + 3705625 = 2992^2 + 1925^2 .

It is a de Polignac number, because none of the positive numbers 2^k-12657689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12657289) 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, 8117 + ... + 9549.

It is an arithmetic number, because the mean of its divisors is an integer number (1176119).

Almost surely, 2^12657689 is an apocalyptic number.

It is an amenable number.

12657689 is a deficient number, since it is larger than the sum of its proper divisors (1455739).

12657689 is a wasteful number, since it uses less digits than its factorization.

12657689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1528 (or 1517 counting only the distinct ones).

The product of its digits is 181440, while the sum is 44.

The square root of 12657689 is about 3557.7646071656. The cubic root of 12657689 is about 233.0512698243.

The spelling of 12657689 in words is "twelve million, six hundred fifty-seven thousand, six hundred eighty-nine".