6816138 has 16 divisors (see below), whose sum is σ = 15579840. Its totient is φ = 1947456.

The previous prime is 6816137. The next prime is 6816149. The reversal of 6816138 is 8316186.

6816138 = 22² + 23² + ... + 273².

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 6816099 and 6816108.

It is not an unprimeable number, because it can be changed into a prime (6816137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 81103 + ... + 81186.

It is an arithmetic number, because the mean of its divisors is an integer number (973740).

Almost surely, 2^6816138 is an apocalyptic number.

6816138 is an abundant number, since it is smaller than the sum of its proper divisors (8763702).

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

6816138 is a wasteful number, since it uses less digits than its factorization.

6816138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162301.

The product of its digits is 6912, while the sum is 33.

The square root of 6816138 is about 2610.7734486163. The cubic root of 6816138 is about 189.6034017264.

The spelling of 6816138 in words is "six million, eight hundred sixteen thousand, one hundred thirty-eight".