6666838 has 4 divisors (see below), whose sum is σ = 10000260. Its totient is φ = 3333418.

The previous prime is 6666833. The next prime is 6666841. The reversal of 6666838 is 8386666.

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

It is a junction number, because it is equal to n+sod(n) for n = 6666794 and 6666803.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6666833) 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 as a sum of consecutive naturals, namely, 1666708 + ... + 1666711.

It is an arithmetic number, because the mean of its divisors is an integer number (2500065).

Almost surely, 2^6666838 is an apocalyptic number.

6666838 is a deficient number, since it is larger than the sum of its proper divisors (3333422).

6666838 is a wasteful number, since it uses less digits than its factorization.

6666838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3333421.

The product of its digits is 248832, while the sum is 43.

The square root of 6666838 is about 2582.0220758158. The cubic root of 6666838 is about 188.2088180708.

The spelling of 6666838 in words is "six million, six hundred sixty-six thousand, eight hundred thirty-eight".