6840823 has 4 divisors (see below), whose sum is σ = 7462728. Its totient is φ = 6218920.

The previous prime is 6840811. The next prime is 6840857. The reversal of 6840823 is 3280486.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 6840823 - 2¹⁷ = 6709751 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6820823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 310936 + ... + 310957.

It is an arithmetic number, because the mean of its divisors is an integer number (1865682).

Almost surely, 2^6840823 is an apocalyptic number.

6840823 is a deficient number, since it is larger than the sum of its proper divisors (621905).

6840823 is a wasteful number, since it uses less digits than its factorization.

6840823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 621904.

The product of its (nonzero) digits is 9216, while the sum is 31.

The square root of 6840823 is about 2615.4967023493. The cubic root of 6840823 is about 189.8320121828.

The spelling of 6840823 in words is "six million, eight hundred forty thousand, eight hundred twenty-three".