6918685 has 4 divisors (see below), whose sum is σ = 8302428. Its totient is φ = 5534944.

The previous prime is 6918649. The next prime is 6918689. The reversal of 6918685 is 5868196.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1633284 + 5285401 = 1278^2 + 2299^2 .

It is a cyclic number.

It is not a de Polignac number, because 6918685 - 2⁹ = 6918173 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6918689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 691864 + ... + 691873.

It is an arithmetic number, because the mean of its divisors is an integer number (2075607).

Almost surely, 2^6918685 is an apocalyptic number.

It is an amenable number.

6918685 is a deficient number, since it is larger than the sum of its proper divisors (1383743).

6918685 is a wasteful number, since it uses less digits than its factorization.

6918685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1383742.

The product of its digits is 103680, while the sum is 43.

The square root of 6918685 is about 2630.3393317213. The cubic root of 6918685 is about 190.5495171898.

The spelling of 6918685 in words is "six million, nine hundred eighteen thousand, six hundred eighty-five".