6816623 has 4 divisors (see below), whose sum is σ = 7436328. Its totient is φ = 6196920.

The previous prime is 6816617. The next prime is 6816629. The reversal of 6816623 is 3266186.

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

It is an interprime number because it is at equal distance from previous prime (6816617) and next prime (6816629).

It is a cyclic number.

It is not a de Polignac number, because 6816623 - 2⁸ = 6816367 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6816623.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6816629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 309836 + ... + 309857.

It is an arithmetic number, because the mean of its divisors is an integer number (1859082).

Almost surely, 2^6816623 is an apocalyptic number.

6816623 is a deficient number, since it is larger than the sum of its proper divisors (619705).

6816623 is a wasteful number, since it uses less digits than its factorization.

6816623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 619704.

The product of its digits is 10368, while the sum is 32.

The square root of 6816623 is about 2610.8663313161. The cubic root of 6816623 is about 189.6078986751.

The spelling of 6816623 in words is "six million, eight hundred sixteen thousand, six hundred twenty-three".