6981978 has 8 divisors (see below), whose sum is σ = 13963968. Its totient is φ = 2327324.

The previous prime is 6981977. The next prime is 6981983. The reversal of 6981978 is 8791896.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

6981978 is an admirable number.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (6981973) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 581826 + ... + 581837.

It is an arithmetic number, because the mean of its divisors is an integer number (1745496).

Almost surely, 2^6981978 is an apocalyptic number.

6981978 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

6981978 is a wasteful number, since it uses less digits than its factorization.

6981978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1163668.

The product of its digits is 217728, while the sum is 48.

The square root of 6981978 is about 2642.3432782286. The cubic root of 6981978 is about 191.1288112575.

The spelling of 6981978 in words is "six million, nine hundred eighty-one thousand, nine hundred seventy-eight".