6638849 has 4 divisors (see below), whose sum is σ = 7587264. Its totient is φ = 5690436.

The previous prime is 6638803. The next prime is 6638851. The reversal of 6638849 is 9488366.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9488366 = 2 ⋅4744183.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6638849 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (6638249) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 474197 + ... + 474210.

It is an arithmetic number, because the mean of its divisors is an integer number (1896816).

Almost surely, 2^6638849 is an apocalyptic number.

It is an amenable number.

6638849 is a deficient number, since it is larger than the sum of its proper divisors (948415).

6638849 is an equidigital number, since it uses as much as digits as its factorization.

6638849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 948414.

The product of its digits is 248832, while the sum is 44.

The square root of 6638849 is about 2576.5963983519. The cubic root of 6638849 is about 187.9450665666.

The spelling of 6638849 in words is "six million, six hundred thirty-eight thousand, eight hundred forty-nine".