6855638 has 4 divisors (see below), whose sum is σ = 10283460. Its totient is φ = 3427818.

The previous prime is 6855631. The next prime is 6855643. The reversal of 6855638 is 8365586.

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 = 6855595 and 6855604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6855631) 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, 1713908 + ... + 1713911.

It is an arithmetic number, because the mean of its divisors is an integer number (2570865).

Almost surely, 2^6855638 is an apocalyptic number.

6855638 is a deficient number, since it is larger than the sum of its proper divisors (3427822).

6855638 is a wasteful number, since it uses less digits than its factorization.

6855638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3427821.

The product of its digits is 172800, while the sum is 41.

The square root of 6855638 is about 2618.3273286585. The cubic root of 6855638 is about 189.9689515286.

The spelling of 6855638 in words is "six million, eight hundred fifty-five thousand, six hundred thirty-eight".