6679921 has 8 divisors (see below), whose sum is σ = 6953760. Its totient is φ = 6411552.

The previous prime is 6679919. The next prime is 6679931. The reversal of 6679921 is 1299766.

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 6679921 - 2¹ = 6679919 is a prime.

It is a Duffinian number.

6679921 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (6679901) 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, 1221 + ... + 3853.

It is an arithmetic number, because the mean of its divisors is an integer number (869220).

Almost surely, 2^6679921 is an apocalyptic number.

It is an amenable number.

6679921 is a deficient number, since it is larger than the sum of its proper divisors (273839).

6679921 is a wasteful number, since it uses less digits than its factorization.

6679921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2735.

The product of its digits is 40824, while the sum is 40.

The square root of 6679921 is about 2584.5543136100. The cubic root of 6679921 is about 188.3318512601.

The spelling of 6679921 in words is "six million, six hundred seventy-nine thousand, nine hundred twenty-one".