12643697 has 4 divisors (see below), whose sum is σ = 13793136. Its totient is φ = 11494260.

The previous prime is 12643669. The next prime is 12643717. The reversal of 12643697 is 79634621.

12643697 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 12643697 - 2¹⁴ = 12627313 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12643697.

It is not an unprimeable number, because it can be changed into a prime (12603697) 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, 574703 + ... + 574724.

It is an arithmetic number, because the mean of its divisors is an integer number (3448284).

Almost surely, 2^12643697 is an apocalyptic number.

It is an amenable number.

12643697 is a deficient number, since it is larger than the sum of its proper divisors (1149439).

12643697 is a wasteful number, since it uses less digits than its factorization.

12643697 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1149438.

The product of its digits is 54432, while the sum is 38.

The square root of 12643697 is about 3555.7976601601. The cubic root of 12643697 is about 232.9653653690.

The spelling of 12643697 in words is "twelve million, six hundred forty-three thousand, six hundred ninety-seven".