6664393 has 4 divisors (see below), whose sum is σ = 6670800. Its totient is φ = 6657988.

The previous prime is 6664387. The next prime is 6664417. The reversal of 6664393 is 3934666.

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 a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 6664393 - 2¹³ = 6656201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6664093) by changing a digit.

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, 1243 + ... + 3856.

It is an arithmetic number, because the mean of its divisors is an integer number (1667700).

Almost surely, 2^6664393 is an apocalyptic number.

It is an amenable number.

6664393 is a deficient number, since it is larger than the sum of its proper divisors (6407).

6664393 is a wasteful number, since it uses less digits than its factorization.

6664393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6406.

The product of its digits is 69984, while the sum is 37.

The square root of 6664393 is about 2581.5485662679. The cubic root of 6664393 is about 188.1858073209.

The spelling of 6664393 in words is "six million, six hundred sixty-four thousand, three hundred ninety-three".