6639933 has 4 divisors (see below), whose sum is σ = 8853248. Its totient is φ = 4426620.

The previous prime is 6639929. The next prime is 6639937. The reversal of 6639933 is 3399366.

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.

It is an interprime number because it is at equal distance from previous prime (6639929) and next prime (6639937).

It is not a de Polignac number, because 6639933 - 2² = 6639929 is a prime.

It is a d-powerful number, because it can be written as 6² + 6⁸ + 3 + 9² + 9² + 3¹¹ + 3¹⁴ .

It is a D-number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6639891 and 6639900.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6639937) 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, 1106653 + ... + 1106658.

It is an arithmetic number, because the mean of its divisors is an integer number (2213312).

Almost surely, 2^6639933 is an apocalyptic number.

It is an amenable number.

6639933 is a deficient number, since it is larger than the sum of its proper divisors (2213315).

6639933 is a wasteful number, since it uses less digits than its factorization.

6639933 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2213314.

The product of its digits is 78732, while the sum is 39.

The square root of 6639933 is about 2576.8067447909. The cubic root of 6639933 is about 187.9552953159.

The spelling of 6639933 in words is "six million, six hundred thirty-nine thousand, nine hundred thirty-three".