6643393 has 8 divisors (see below), whose sum is σ = 6895616. Its totient is φ = 6400260.

The previous prime is 6643381. The next prime is 6643411. The reversal of 6643393 is 3933466.

It is not a de Polignac number, because 6643393 - 2⁵ = 6643361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6643303) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29680 + ... + 29902.

It is an arithmetic number, because the mean of its divisors is an integer number (861952).

Almost surely, 2^6643393 is an apocalyptic number.

It is an amenable number.

6643393 is a deficient number, since it is larger than the sum of its proper divisors (252223).

6643393 is an frugal number, since it uses more digits than its factorization.

6643393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 316 (or 254 counting only the distinct ones).

The product of its digits is 34992, while the sum is 34.

The square root of 6643393 is about 2577.4780309442. The cubic root of 6643393 is about 187.9879368297.

The spelling of 6643393 in words is "six million, six hundred forty-three thousand, three hundred ninety-three".