6887921 has 8 divisors (see below), whose sum is σ = 7198464. Its totient is φ = 6582960.

The previous prime is 6887917. The next prime is 6887927. The reversal of 6887921 is 1297886.

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 6887921 - 2² = 6887917 is a prime.

It is a d-powerful number, because it can be written as 6⁵ + 8 + 8 + 7 + 9⁷ + 2²¹ + 1 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6887927) 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, 1235 + ... + 3911.

It is an arithmetic number, because the mean of its divisors is an integer number (899808).

Almost surely, 2^6887921 is an apocalyptic number.

It is an amenable number.

6887921 is a deficient number, since it is larger than the sum of its proper divisors (310543).

6887921 is a wasteful number, since it uses less digits than its factorization.

6887921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2791.

The product of its digits is 48384, while the sum is 41.

The square root of 6887921 is about 2624.4849018426. The cubic root of 6887921 is about 190.2666707890.

The spelling of 6887921 in words is "six million, eight hundred eighty-seven thousand, nine hundred twenty-one".