6918945 has 32 divisors (see below), whose sum is σ = 12718080. Its totient is φ = 3176640.

The previous prime is 6918943. The next prime is 6918953. The reversal of 6918945 is 5498196.

6918945 = 110² + 111² + ... + 280².

It is not a de Polignac number, because 6918945 - 2¹ = 6918943 is a prime.

It is a Curzon number.

6918945 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 6918897 and 6918906.

It is not an unprimeable number, because it can be changed into a prime (6918943) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2032 + ... + 4238.

It is an arithmetic number, because the mean of its divisors is an integer number (397440).

Almost surely, 2^6918945 is an apocalyptic number.

It is an amenable number.

6918945 is a deficient number, since it is larger than the sum of its proper divisors (5799135).

6918945 is a wasteful number, since it uses less digits than its factorization.

6918945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2245.

The product of its digits is 77760, while the sum is 42.

The square root of 6918945 is about 2630.3887545380. The cubic root of 6918945 is about 190.5519040718.

The spelling of 6918945 in words is "six million, nine hundred eighteen thousand, nine hundred forty-five".