6918389 has 2 divisors, whose sum is σ = 6918390. Its totient is φ = 6918388.

The previous prime is 6918383. The next prime is 6918391. The reversal of 6918389 is 9838196.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4986289 + 1932100 = 2233^2 + 1390^2 .

It is a cyclic number.

It is not a de Polignac number, because 6918389 - 2¹² = 6914293 is a prime.

Together with 6918391, 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 (6918383) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3459194 + 3459195.

It is an arithmetic number, because the mean of its divisors is an integer number (3459195).

Almost surely, 2^6918389 is an apocalyptic number.

It is an amenable number.

6918389 is a deficient number, since it is larger than the sum of its proper divisors (1).

6918389 is an equidigital number, since it uses as much as digits as its factorization.

6918389 is an evil number, because the sum of its binary digits is even.

The product of its digits is 93312, while the sum is 44.

The square root of 6918389 is about 2630.2830646149. The cubic root of 6918389 is about 190.5467997436.

The spelling of 6918389 in words is "six million, nine hundred eighteen thousand, three hundred eighty-nine".