6639105 has 16 divisors (see below), whose sum is σ = 11588544. Its totient is φ = 3218880.

The previous prime is 6639077. The next prime is 6639107. The reversal of 6639105 is 5019366.

It is a happy number.

It is not a de Polignac number, because 6639105 - 2⁶ = 6639041 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6639107) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19954 + ... + 20283.

It is an arithmetic number, because the mean of its divisors is an integer number (724284).

Almost surely, 2^6639105 is an apocalyptic number.

It is an amenable number.

6639105 is a deficient number, since it is larger than the sum of its proper divisors (4949439).

6639105 is a wasteful number, since it uses less digits than its factorization.

6639105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40256.

The product of its (nonzero) digits is 4860, while the sum is 30.

The square root of 6639105 is about 2576.6460758125. The cubic root of 6639105 is about 187.9474823126.

The spelling of 6639105 in words is "six million, six hundred thirty-nine thousand, one hundred five".