6918985 has 4 divisors (see below), whose sum is σ = 8302788. Its totient is φ = 5535184.

The previous prime is 6918979. The next prime is 6918997. The reversal of 6918985 is 5898196.

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 808201 + 6110784 = 899^2 + 2472^2 .

It is a cyclic number.

It is not a de Polignac number, because 6918985 - 2⁵ = 6918953 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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, 691894 + ... + 691903.

It is an arithmetic number, because the mean of its divisors is an integer number (2075697).

Almost surely, 2^6918985 is an apocalyptic number.

It is an amenable number.

6918985 is a deficient number, since it is larger than the sum of its proper divisors (1383803).

6918985 is a wasteful number, since it uses less digits than its factorization.

6918985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1383802.

The product of its digits is 155520, while the sum is 46.

The square root of 6918985 is about 2630.3963579658. The cubic root of 6918985 is about 190.5522712791.

The spelling of 6918985 in words is "six million, nine hundred eighteen thousand, nine hundred eighty-five".