6718945 has 4 divisors (see below), whose sum is σ = 8062740. Its totient is φ = 5375152.

The previous prime is 6718939. The next prime is 6718963. The reversal of 6718945 is 5498176.

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 3701776 + 3017169 = 1924^2 + 1737^2 .

It is a cyclic number.

It is not a de Polignac number, because 6718945 - 2³ = 6718937 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 6718898 and 6718907.

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, 671890 + ... + 671899.

It is an arithmetic number, because the mean of its divisors is an integer number (2015685).

Almost surely, 2^6718945 is an apocalyptic number.

It is an amenable number.

6718945 is a deficient number, since it is larger than the sum of its proper divisors (1343795).

6718945 is a wasteful number, since it uses less digits than its factorization.

6718945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1343794.

The product of its digits is 60480, while the sum is 40.

The square root of 6718945 is about 2592.0927838332. The cubic root of 6718945 is about 188.6978833642.

The spelling of 6718945 in words is "six million, seven hundred eighteen thousand, nine hundred forty-five".