720947 has 2 divisors, whose sum is σ = 720948. Its totient is φ = 720946.

The previous prime is 720943. The next prime is 720961. The reversal of 720947 is 749027.

It is a weak prime.

It is an emirp because it is prime and its reverse (749027) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 720947 - 2² = 720943 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (720943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360473 + 360474.

It is an arithmetic number, because the mean of its divisors is an integer number (360474).

2⁷²⁰⁹⁴⁷ is an apocalyptic number.

720947 is a deficient number, since it is larger than the sum of its proper divisors (1).

720947 is an equidigital number, since it uses as much as digits as its factorization.

720947 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3528, while the sum is 29.

The square root of 720947 is about 849.0859791564. The cubic root of 720947 is about 89.6673729962.

The spelling of 720947 in words is "seven hundred twenty thousand, nine hundred forty-seven".