720899 has 2 divisors, whose sum is σ = 720900. Its totient is φ = 720898.

The previous prime is 720887. The next prime is 720901. The reversal of 720899 is 998027.

It is a strong prime.

It is an emirp because it is prime and its reverse (998027) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-720899 is a prime.

Together with 720901, it forms a pair of twin primes.

It is a Chen prime.

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

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360449 + 360450.

It is an arithmetic number, because the mean of its divisors is an integer number (360450).

2⁷²⁰⁸⁹⁹ is an apocalyptic number.

720899 is a deficient number, since it is larger than the sum of its proper divisors (1).

720899 is an equidigital number, since it uses as much as digits as its factorization.

720899 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9072, while the sum is 35.

The square root of 720899 is about 849.0577129972. The cubic root of 720899 is about 89.6653829611.

The spelling of 720899 in words is "seven hundred twenty thousand, eight hundred ninety-nine".