6851978 has 8 divisors (see below), whose sum is σ = 11746272. Its totient is φ = 2936556.

The previous prime is 6851963. The next prime is 6851987. The reversal of 6851978 is 8791586.

It is a happy number.

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

It is a Curzon number.

It is a nialpdrome in base 14.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 244700 + ... + 244727.

It is an arithmetic number, because the mean of its divisors is an integer number (1468284).

Almost surely, 2^6851978 is an apocalyptic number.

6851978 is a deficient number, since it is larger than the sum of its proper divisors (4894294).

6851978 is a wasteful number, since it uses less digits than its factorization.

6851978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 489436.

The product of its digits is 120960, while the sum is 44.

The square root of 6851978 is about 2617.6283158615. The cubic root of 6851978 is about 189.9351394492.

The spelling of 6851978 in words is "six million, eight hundred fifty-one thousand, nine hundred seventy-eight".