12918887 has 2 divisors, whose sum is σ = 12918888. Its totient is φ = 12918886.

The previous prime is 12918853. The next prime is 12918889. The reversal of 12918887 is 78881921.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12918887 is a prime.

Together with 12918889, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12918889) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6459443 + 6459444.

It is an arithmetic number, because the mean of its divisors is an integer number (6459444).

Almost surely, 2^12918887 is an apocalyptic number.

12918887 is a deficient number, since it is larger than the sum of its proper divisors (1).

12918887 is an equidigital number, since it uses as much as digits as its factorization.

12918887 is an evil number, because the sum of its binary digits is even.

The product of its digits is 64512, while the sum is 44.

The square root of 12918887 is about 3594.2853253463. The cubic root of 12918887 is about 234.6434127142.

The spelling of 12918887 in words is "twelve million, nine hundred eighteen thousand, eight hundred eighty-seven".