6879639 has 8 divisors (see below), whose sum is σ = 9878512. Its totient is φ = 4233600.

The previous prime is 6879589. The next prime is 6879643. The reversal of 6879639 is 9369786.

It is a happy number.

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

It is not a de Polignac number, because 6879639 - 2⁷ = 6879511 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6879839) 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, 88162 + ... + 88239.

It is an arithmetic number, because the mean of its divisors is an integer number (1234814).

Almost surely, 2^6879639 is an apocalyptic number.

6879639 is a deficient number, since it is larger than the sum of its proper divisors (2998873).

6879639 is a wasteful number, since it uses less digits than its factorization.

6879639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176417.

The product of its digits is 489888, while the sum is 48.

The square root of 6879639 is about 2622.9065938382. The cubic root of 6879639 is about 190.1903816560.

It can be divided in two parts, 68796 and 39, that multiplied together give a square (2683044 = 1638²).

The spelling of 6879639 in words is "six million, eight hundred seventy-nine thousand, six hundred thirty-nine".