6639493 has 8 divisors (see below), whose sum is σ = 7987520. Its totient is φ = 5391360.

The previous prime is 6639481. The next prime is 6639497. The reversal of 6639493 is 3949366.

6639493 is digitally balanced in base 8, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 6639493 - 2¹⁷ = 6508421 is a prime.

It is an Ulam number.

It is a Duffinian number.

6639493 is strictly pandigital in base 8.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6639497) 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, 24828 + ... + 25093.

It is an arithmetic number, because the mean of its divisors is an integer number (998440).

Almost surely, 2^6639493 is an apocalyptic number.

It is an amenable number.

6639493 is a deficient number, since it is larger than the sum of its proper divisors (1348027).

6639493 is a wasteful number, since it uses less digits than its factorization.

6639493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49947.

The product of its digits is 104976, while the sum is 40.

The square root of 6639493 is about 2576.7213663879. The cubic root of 6639493 is about 187.9511435593.

The spelling of 6639493 in words is "six million, six hundred thirty-nine thousand, four hundred ninety-three".