6840638 has 8 divisors (see below), whose sum is σ = 11726832. Its totient is φ = 2931696.

The previous prime is 6840619. The next prime is 6840643. The reversal of 6840638 is 8360486.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 6840598 and 6840607.

It is a congruent number.

It is an unprimeable number.

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, 244295 + ... + 244322.

It is an arithmetic number, because the mean of its divisors is an integer number (1465854).

Almost surely, 2^6840638 is an apocalyptic number.

6840638 is a deficient number, since it is larger than the sum of its proper divisors (4886194).

6840638 is a wasteful number, since it uses less digits than its factorization.

6840638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 488626.

The product of its (nonzero) digits is 27648, while the sum is 35.

The square root of 6840638 is about 2615.4613359788. The cubic root of 6840638 is about 189.8303009248.

The spelling of 6840638 in words is "six million, eight hundred forty thousand, six hundred thirty-eight".