6818139 has 12 divisors (see below), whose sum is σ = 10427976. Its totient is φ = 4277952.

The previous prime is 6818137. The next prime is 6818159. The reversal of 6818139 is 9318186.

It is not a de Polignac number, because 6818139 - 2¹ = 6818137 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (6818137) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 22129 + ... + 22434.

It is an arithmetic number, because the mean of its divisors is an integer number (868998).

Almost surely, 2^6818139 is an apocalyptic number.

6818139 is a deficient number, since it is larger than the sum of its proper divisors (3609837).

6818139 is a wasteful number, since it uses less digits than its factorization.

6818139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44586 (or 44583 counting only the distinct ones).

The product of its digits is 10368, while the sum is 36.

The square root of 6818139 is about 2611.1566402650. The cubic root of 6818139 is about 189.6219537416.

The spelling of 6818139 in words is "six million, eight hundred eighteen thousand, one hundred thirty-nine".