6981878 has 4 divisors (see below), whose sum is σ = 10472820. Its totient is φ = 3490938.

The previous prime is 6981859. The next prime is 6981889. The reversal of 6981878 is 8781896.

It is a semiprime because it is the product of two primes.

It is an alternating number because its digits alternate between even and odd.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1745468 + ... + 1745471.

It is an arithmetic number, because the mean of its divisors is an integer number (2618205).

Almost surely, 2^6981878 is an apocalyptic number.

6981878 is a deficient number, since it is larger than the sum of its proper divisors (3490942).

6981878 is a wasteful number, since it uses less digits than its factorization.

6981878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3490941.

The product of its digits is 193536, while the sum is 47.

The square root of 6981878 is about 2642.3243555627. The cubic root of 6981878 is about 191.1278987667.

It can be divided in two parts, 69818 and 78, that added together give a palindrome (69896).

The spelling of 6981878 in words is "six million, nine hundred eighty-one thousand, eight hundred seventy-eight".