6921716 has 6 divisors (see below), whose sum is σ = 12113010. Its totient is φ = 3460856.

The previous prime is 6921709. The next prime is 6921727. The reversal of 6921716 is 6171296.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 4972900 + 1948816 = 2230^2 + 1396^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 865211 + ... + 865218.

It is an arithmetic number, because the mean of its divisors is an integer number (2018835).

Almost surely, 2^6921716 is an apocalyptic number.

It is an amenable number.

6921716 is a deficient number, since it is larger than the sum of its proper divisors (5191294).

6921716 is a wasteful number, since it uses less digits than its factorization.

6921716 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1730433 (or 1730431 counting only the distinct ones).

The product of its digits is 4536, while the sum is 32.

The square root of 6921716 is about 2630.9154300357. The cubic root of 6921716 is about 190.5773390117.

The spelling of 6921716 in words is "six million, nine hundred twenty-one thousand, seven hundred sixteen".