6978388 has 6 divisors (see below), whose sum is σ = 12212186. Its totient is φ = 3489192.

The previous prime is 6978383. The next prime is 6978421. The reversal of 6978388 is 8838796.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 6091024 + 887364 = 2468^2 + 942^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6978383) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 872295 + ... + 872302.

Almost surely, 2^6978388 is an apocalyptic number.

It is an amenable number.

6978388 is a deficient number, since it is larger than the sum of its proper divisors (5233798).

6978388 is a wasteful number, since it uses less digits than its factorization.

6978388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1744601 (or 1744599 counting only the distinct ones).

The product of its digits is 580608, while the sum is 49.

The square root of 6978388 is about 2641.6638696095. The cubic root of 6978388 is about 191.0960473775.

The spelling of 6978388 in words is "six million, nine hundred seventy-eight thousand, three hundred eighty-eight".