6639386 has 8 divisors (see below), whose sum is σ = 10725204. Its totient is φ = 3064320.

The previous prime is 6639383. The next prime is 6639389. The reversal of 6639386 is 6839366.

It is an interprime number because it is at equal distance from previous prime (6639383) and next prime (6639389).

It can be written as a sum of positive squares in 2 ways, for example, as 5669161 + 970225 = 2381^2 + 985^2 .

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

It is a super-3 number, since 3×6639386³ (a number of 21 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (6639383) 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, 127655 + ... + 127706.

Almost surely, 2^6639386 is an apocalyptic number.

6639386 is a deficient number, since it is larger than the sum of its proper divisors (4085818).

6639386 is a wasteful number, since it uses less digits than its factorization.

6639386 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 255376.

The product of its digits is 139968, while the sum is 41.

The square root of 6639386 is about 2576.7006034850. The cubic root of 6639386 is about 187.9501338998.

The spelling of 6639386 in words is "six million, six hundred thirty-nine thousand, three hundred eighty-six".