716821 has 6 divisors (see below), whose sum is σ = 833910. Its totient is φ = 614376.

The previous prime is 716819. The next prime is 716827. The reversal of 716821 is 128617.

It can be written as a sum of positive squares in only one way, i.e., 509796 + 207025 = 714^2 + 455^2 .

It is not a de Polignac number, because 716821 - 2¹ = 716819 is a prime.

It is a zygodrome in base 4.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (716827) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7266 + ... + 7363.

It is an arithmetic number, because the mean of its divisors is an integer number (138985).

2⁷¹⁶⁸²¹ is an apocalyptic number.

It is an amenable number.

716821 is a deficient number, since it is larger than the sum of its proper divisors (117089).

716821 is a wasteful number, since it uses less digits than its factorization.

716821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14643 (or 14636 counting only the distinct ones).

The product of its digits is 672, while the sum is 25.

The square root of 716821 is about 846.6528214091. The cubic root of 716821 is about 89.4959893337.

The spelling of 716821 in words is "seven hundred sixteen thousand, eight hundred twenty-one".