720869 has 2 divisors, whose sum is σ = 720870. Its totient is φ = 720868.

The previous prime is 720857. The next prime is 720877. The reversal of 720869 is 968027.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 664225 + 56644 = 815^2 + 238^2 .

It is an emirp because it is prime and its reverse (968027) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-720869 is a prime.

It is a super-2 number, since 2×720869² = 1039304230322, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (720829) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360434 + 360435.

It is an arithmetic number, because the mean of its divisors is an integer number (360435).

2⁷²⁰⁸⁶⁹ is an apocalyptic number.

It is an amenable number.

720869 is a deficient number, since it is larger than the sum of its proper divisors (1).

720869 is an equidigital number, since it uses as much as digits as its factorization.

720869 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6048, while the sum is 32.

The square root of 720869 is about 849.0400461698. The cubic root of 720869 is about 89.6641391443.

The spelling of 720869 in words is "seven hundred twenty thousand, eight hundred sixty-nine".