12688397 has 4 divisors (see below), whose sum is σ = 12983520. Its totient is φ = 12393276.

The previous prime is 12688391. The next prime is 12688411. The reversal of 12688397 is 79388621.

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.

It is a cyclic number.

It is not a de Polignac number, because 12688397 - 2⁸ = 12688141 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12688391) 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, 147497 + ... + 147582.

It is an arithmetic number, because the mean of its divisors is an integer number (3245880).

Almost surely, 2^12688397 is an apocalyptic number.

It is an amenable number.

12688397 is a deficient number, since it is larger than the sum of its proper divisors (295123).

12688397 is an equidigital number, since it uses as much as digits as its factorization.

12688397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 295122.

The product of its digits is 145152, while the sum is 44.

The square root of 12688397 is about 3562.0776240840. The cubic root of 12688397 is about 233.2395811567.

The spelling of 12688397 in words is "twelve million, six hundred eighty-eight thousand, three hundred ninety-seven".