6918409 has 2 divisors, whose sum is σ = 6918410. Its totient is φ = 6918408.

The previous prime is 6918403. The next prime is 6918419. The reversal of 6918409 is 9048196.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4112784 + 2805625 = 2028^2 + 1675^2 .

It is a cyclic number.

It is not a de Polignac number, because 6918409 - 2¹⁹ = 6394121 is a prime.

6918409 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (6918403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3459204 + 3459205.

It is an arithmetic number, because the mean of its divisors is an integer number (3459205).

Almost surely, 2^6918409 is an apocalyptic number.

It is an amenable number.

6918409 is a deficient number, since it is larger than the sum of its proper divisors (1).

6918409 is an equidigital number, since it uses as much as digits as its factorization.

6918409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15552, while the sum is 37.

The square root of 6918409 is about 2630.2868664843. The cubic root of 6918409 is about 190.5469833573.

The spelling of 6918409 in words is "six million, nine hundred eighteen thousand, four hundred nine".