6638841 has 20 divisors (see below), whose sum is σ = 10820304. Its totient is φ = 4023000.

The previous prime is 6638803. The next prime is 6638851. The reversal of 6638841 is 1488366.

It is a happy number.

It is not a de Polignac number, because 6638841 - 2¹⁴ = 6622457 is a prime.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 6638796 and 6638805.

It is not an unprimeable number, because it can be changed into a prime (6638851) 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 in 19 ways as a sum of consecutive naturals, for example, 2835 + ... + 4616.

Almost surely, 2^6638841 is an apocalyptic number.

It is an amenable number.

6638841 is a deficient number, since it is larger than the sum of its proper divisors (4181463).

6638841 is a wasteful number, since it uses less digits than its factorization.

6638841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7474 (or 7465 counting only the distinct ones).

The product of its digits is 27648, while the sum is 36.

The square root of 6638841 is about 2576.5948459158. The cubic root of 6638841 is about 187.9449910736.

The spelling of 6638841 in words is "six million, six hundred thirty-eight thousand, eight hundred forty-one".