6643246 has 4 divisors (see below), whose sum is σ = 9964872. Its totient is φ = 3321622.

The previous prime is 6643229. The next prime is 6643249. The reversal of 6643246 is 6423466.

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

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6643249) 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, 1660810 + ... + 1660813.

It is an arithmetic number, because the mean of its divisors is an integer number (2491218).

Almost surely, 2^6643246 is an apocalyptic number.

6643246 is a deficient number, since it is larger than the sum of its proper divisors (3321626).

6643246 is a wasteful number, since it uses less digits than its factorization.

6643246 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3321625.

The product of its digits is 20736, while the sum is 31.

The square root of 6643246 is about 2577.4495145395. The cubic root of 6643246 is about 187.9865502676.

It can be divided in two parts, 6643 and 246, that added together give a square (6889 = 83²).

The spelling of 6643246 in words is "six million, six hundred forty-three thousand, two hundred forty-six".