6981816 has 64 divisors (see below), whose sum is σ = 18748800. Its totient is φ = 2160000.

The previous prime is 6981791. The next prime is 6981823. The reversal of 6981816 is 6181896.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27691 + ... + 27941.

It is an arithmetic number, because the mean of its divisors is an integer number (292950).

Almost surely, 2^6981816 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6981816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9374400).

6981816 is an abundant number, since it is smaller than the sum of its proper divisors (11766984).

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

6981816 is a wasteful number, since it uses less digits than its factorization.

6981816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 340 (or 336 counting only the distinct ones).

The product of its digits is 20736, while the sum is 39.

The square root of 6981816 is about 2642.3126234418. The cubic root of 6981816 is about 191.1273330180.

The spelling of 6981816 in words is "six million, nine hundred eighty-one thousand, eight hundred sixteen".