6987321 has 24 divisors (see below), whose sum is σ = 11103456. Its totient is φ = 4199040.

The previous prime is 6987293. The next prime is 6987359. The reversal of 6987321 is 1237896.

6987321 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 6987321 - 2⁶ = 6987257 is a prime.

6987321 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (6987821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15921 + ... + 16353.

It is an arithmetic number, because the mean of its divisors is an integer number (462644).

Almost surely, 2^6987321 is an apocalyptic number.

It is an amenable number.

6987321 is a deficient number, since it is larger than the sum of its proper divisors (4116135).

6987321 is a wasteful number, since it uses less digits than its factorization.

6987321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 613 (or 610 counting only the distinct ones).

The product of its digits is 18144, while the sum is 36.

The square root of 6987321 is about 2643.3541192962. The cubic root of 6987321 is about 191.1775529777.

The spelling of 6987321 in words is "six million, nine hundred eighty-seven thousand, three hundred twenty-one".