12918839 has 2 divisors, whose sum is σ = 12918840. Its totient is φ = 12918838.

The previous prime is 12918811. The next prime is 12918853. The reversal of 12918839 is 93881921.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12918839 - 2⁸ = 12918583 is a prime.

It is a super-2 number, since 2×12918839² = 333792802215842, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 12918796 and 12918805.

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, 6459419 + 6459420.

It is an arithmetic number, because the mean of its divisors is an integer number (6459420).

Almost surely, 2^12918839 is an apocalyptic number.

12918839 is a deficient number, since it is larger than the sum of its proper divisors (1).

12918839 is an equidigital number, since it uses as much as digits as its factorization.

12918839 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31104, while the sum is 41.

The square root of 12918839 is about 3594.2786480739. The cubic root of 12918839 is about 234.6431221087.

The spelling of 12918839 in words is "twelve million, nine hundred eighteen thousand, eight hundred thirty-nine".