6978321 has 24 divisors (see below), whose sum is σ = 11591424. Its totient is φ = 3962880.

The previous prime is 6978319. The next prime is 6978371. The reversal of 6978321 is 1238796.

It is not a de Polignac number, because 6978321 - 2¹ = 6978319 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6978371) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15976 + ... + 16406.

It is an arithmetic number, because the mean of its divisors is an integer number (482976).

Almost surely, 2^6978321 is an apocalyptic number.

It is an amenable number.

6978321 is a deficient number, since it is larger than the sum of its proper divisors (4613103).

6978321 is a wasteful number, since it uses less digits than its factorization.

6978321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 701 (or 698 counting only the distinct ones).

The product of its digits is 18144, while the sum is 36.

The square root of 6978321 is about 2641.6511881776. The cubic root of 6978321 is about 191.0954357999.

The spelling of 6978321 in words is "six million, nine hundred seventy-eight thousand, three hundred twenty-one".