789721 has 2 divisors, whose sum is σ = 789722. Its totient is φ = 789720.

The previous prime is 789713. The next prime is 789731. The reversal of 789721 is 127987.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 741321 + 48400 = 861^2 + 220^2 .

It is a cyclic number.

It is not a de Polignac number, because 789721 - 2³ = 789713 is a prime.

It is not a weakly prime, because it can be changed into another prime (789731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 394860 + 394861.

It is an arithmetic number, because the mean of its divisors is an integer number (394861).

2⁷⁸⁹⁷²¹ is an apocalyptic number.

It is an amenable number.

789721 is a deficient number, since it is larger than the sum of its proper divisors (1).

789721 is an equidigital number, since it uses as much as digits as its factorization.

789721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7056, while the sum is 34.

The square root of 789721 is about 888.6624781097. The cubic root of 789721 is about 92.4324708003.

The spelling of 789721 in words is "seven hundred eighty-nine thousand, seven hundred twenty-one".