12918637 has 2 divisors, whose sum is σ = 12918638. Its totient is φ = 12918636.

The previous prime is 12918583. The next prime is 12918671. The reversal of 12918637 is 73681921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12773476 + 145161 = 3574^2 + 381^2 .

It is an emirp because it is prime and its reverse (73681921) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12918637 - 2⁷ = 12918509 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12918596 and 12918605.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12918677) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6459318 + 6459319.

It is an arithmetic number, because the mean of its divisors is an integer number (6459319).

Almost surely, 2^12918637 is an apocalyptic number.

It is an amenable number.

12918637 is a deficient number, since it is larger than the sum of its proper divisors (1).

12918637 is an equidigital number, since it uses as much as digits as its factorization.

12918637 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18144, while the sum is 37.

The square root of 12918637 is about 3594.2505477498. The cubic root of 12918637 is about 234.6418991361.

The spelling of 12918637 in words is "twelve million, nine hundred eighteen thousand, six hundred thirty-seven".