6579921 has 8 divisors (see below), whose sum is σ = 8788960. Its totient is φ = 4378752.

The previous prime is 6579919. The next prime is 6579929. The reversal of 6579921 is 1299756.

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

It is not a de Polignac number, because 6579921 - 2¹ = 6579919 is a prime.

It is a Duffinian number.

6579921 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 6579921.

It is not an unprimeable number, because it can be changed into a prime (6579929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 390 + ... + 3648.

It is an arithmetic number, because the mean of its divisors is an integer number (1098620).

Almost surely, 2^6579921 is an apocalyptic number.

It is an amenable number.

6579921 is a deficient number, since it is larger than the sum of its proper divisors (2209039).

6579921 is a wasteful number, since it uses less digits than its factorization.

6579921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3935.

The product of its digits is 34020, while the sum is 39.

The square root of 6579921 is about 2565.1356689267. The cubic root of 6579921 is about 187.3873314222.

The spelling of 6579921 in words is "six million, five hundred seventy-nine thousand, nine hundred twenty-one".