6918840 has 48 divisors (see below), whose sum is σ = 22487400. Its totient is φ = 1844928.

The previous prime is 6918839. The next prime is 6918851. The reversal of 6918840 is 488196.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 6918795 and 6918804.

It is a congruent 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 11 ways as a sum of consecutive naturals, for example, 9250 + ... + 9969.

Almost surely, 2^6918840 is an apocalyptic number.

6918840 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

6918840 is an abundant number, since it is smaller than the sum of its proper divisors (15568560).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6918840 is a wasteful number, since it uses less digits than its factorization.

6918840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19236 (or 19229 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 36.

The square root of 6918840 is about 2630.3687954353. The cubic root of 6918840 is about 190.5509401458.

The spelling of 6918840 in words is "six million, nine hundred eighteen thousand, eight hundred forty".