12667257 has 6 divisors (see below), whose sum is σ = 18297162. Its totient is φ = 8444832.

The previous prime is 12667253. The next prime is 12667267. The reversal of 12667257 is 75276621.

It can be written as a sum of positive squares in only one way, i.e., 10653696 + 2013561 = 3264^2 + 1419^2 .

It is not a de Polignac number, because 12667257 - 2² = 12667253 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12667253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 703728 + ... + 703745.

It is an arithmetic number, because the mean of its divisors is an integer number (3049527).

Almost surely, 2^12667257 is an apocalyptic number.

It is an amenable number.

12667257 is a deficient number, since it is larger than the sum of its proper divisors (5629905).

12667257 is a wasteful number, since it uses less digits than its factorization.

12667257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1407479 (or 1407476 counting only the distinct ones).

The product of its digits is 35280, while the sum is 36.

The square root of 12667257 is about 3559.1090177178. The cubic root of 12667257 is about 233.1099765108.

The spelling of 12667257 in words is "twelve million, six hundred sixty-seven thousand, two hundred fifty-seven".