6639418 has 8 divisors (see below), whose sum is σ = 10545012. Its totient is φ = 3124416.

The previous prime is 6639407. The next prime is 6639439. The reversal of 6639418 is 8149366.

It can be written as a sum of positive squares in 2 ways, for example, as 6066369 + 573049 = 2463^2 + 757^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 97605 + ... + 97672.

Almost surely, 2^6639418 is an apocalyptic number.

6639418 is a deficient number, since it is larger than the sum of its proper divisors (3905594).

6639418 is a wasteful number, since it uses less digits than its factorization.

6639418 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 195296.

The product of its digits is 31104, while the sum is 37.

The square root of 6639418 is about 2576.7068129688. The cubic root of 6639418 is about 187.9504358552.

The spelling of 6639418 in words is "six million, six hundred thirty-nine thousand, four hundred eighteen".