6978438 has 24 divisors (see below), whose sum is σ = 15180048. Its totient is φ = 2316912.

The previous prime is 6978437. The next prime is 6978451. The reversal of 6978438 is 8348796.

It is a happy number.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 6978393 and 6978402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6978431) 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 in 11 ways as a sum of consecutive naturals, for example, 5095 + ... + 6317.

It is an arithmetic number, because the mean of its divisors is an integer number (632502).

Almost surely, 2^6978438 is an apocalyptic number.

6978438 is an abundant number, since it is smaller than the sum of its proper divisors (8201610).

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

6978438 is a wasteful number, since it uses less digits than its factorization.

6978438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1548 (or 1545 counting only the distinct ones).

The product of its digits is 290304, while the sum is 45.

The square root of 6978438 is about 2641.6733333249. The cubic root of 6978438 is about 191.0965037761.

The spelling of 6978438 in words is "six million, nine hundred seventy-eight thousand, four hundred thirty-eight".