6840861 has 4 divisors (see below), whose sum is σ = 9121152. Its totient is φ = 4560572.

The previous prime is 6840857. The next prime is 6840871. The reversal of 6840861 is 1680486.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 6840861 - 2² = 6840857 is a prime.

It is a D-number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6840811) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1140141 + ... + 1140146.

It is an arithmetic number, because the mean of its divisors is an integer number (2280288).

Almost surely, 2^6840861 is an apocalyptic number.

It is an amenable number.

6840861 is a deficient number, since it is larger than the sum of its proper divisors (2280291).

6840861 is a wasteful number, since it uses less digits than its factorization.

6840861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2280290.

The product of its (nonzero) digits is 9216, while the sum is 33.

The square root of 6840861 is about 2615.5039667338. The cubic root of 6840861 is about 189.8323636806.

The spelling of 6840861 in words is "six million, eight hundred forty thousand, eight hundred sixty-one".