6978440 has 32 divisors (see below), whose sum is σ = 17945280. Its totient is φ = 2392512.

The previous prime is 6978437. The next prime is 6978451. The reversal of 6978440 is 448796.

It is a happy number.

6978440 is digitally balanced in base 8, because in such base it contains all the possibile digits an equal number of times.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors.

It is an Ulam number.

6978440 is strictly pandigital in base 8.

It is a junction number, because it is equal to n+sod(n) for n = 6978394 and 6978403.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12182 + ... + 12741.

It is an arithmetic number, because the mean of its divisors is an integer number (560790).

Almost surely, 2^6978440 is an apocalyptic number.

It is an amenable number.

6978440 is an abundant number, since it is smaller than the sum of its proper divisors (10966840).

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

6978440 is a wasteful number, since it uses less digits than its factorization.

6978440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24941 (or 24937 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 38.

The square root of 6978440 is about 2641.6737118728. The cubic root of 6978440 is about 191.0965220320.

The spelling of 6978440 in words is "six million, nine hundred seventy-eight thousand, four hundred forty".