6921764 has 6 divisors (see below), whose sum is σ = 12113094. Its totient is φ = 3460880.

The previous prime is 6921763. The next prime is 6921779. The reversal of 6921764 is 4671296.

It can be written as a sum of positive squares in only one way, i.e., 4494400 + 2427364 = 2120^2 + 1558^2 .

It is not an unprimeable number, because it can be changed into a prime (6921763) 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 as a sum of consecutive naturals, namely, 865217 + ... + 865224.

It is an arithmetic number, because the mean of its divisors is an integer number (2018849).

Almost surely, 2^6921764 is an apocalyptic number.

It is an amenable number.

6921764 is a deficient number, since it is larger than the sum of its proper divisors (5191330).

6921764 is a wasteful number, since it uses less digits than its factorization.

6921764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1730445 (or 1730443 counting only the distinct ones).

The product of its digits is 18144, while the sum is 35.

The square root of 6921764 is about 2630.9245523200. The cubic root of 6921764 is about 190.5777795427.

The spelling of 6921764 in words is "six million, nine hundred twenty-one thousand, seven hundred sixty-four".