6639007 has 8 divisors (see below), whose sum is σ = 6844320. Its totient is φ = 6435840.

The previous prime is 6639001. The next prime is 6639011. The reversal of 6639007 is 7009366.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6639007 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6639007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6639001) 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, 7494 + ... + 8332.

It is an arithmetic number, because the mean of its divisors is an integer number (855540).

Almost surely, 2^6639007 is an apocalyptic number.

6639007 is a deficient number, since it is larger than the sum of its proper divisors (205313).

6639007 is a wasteful number, since it uses less digits than its factorization.

6639007 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1073.

The product of its (nonzero) digits is 6804, while the sum is 31.

The square root of 6639007 is about 2576.6270587728. The cubic root of 6639007 is about 187.9465575422.

The spelling of 6639007 in words is "six million, six hundred thirty-nine thousand, seven".