720017 has 4 divisors (see below), whose sum is σ = 721716. Its totient is φ = 718320.

The previous prime is 720007. The next prime is 720019. The reversal of 720017 is 710027.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 410881 + 309136 = 641^2 + 556^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-720017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 719977 and 720004.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 720017.

It is not an unprimeable number, because it can be changed into a prime (720019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 383 + ... + 1259.

It is an arithmetic number, because the mean of its divisors is an integer number (180429).

2⁷²⁰⁰¹⁷ is an apocalyptic number.

It is an amenable number.

720017 is a deficient number, since it is larger than the sum of its proper divisors (1699).

720017 is an equidigital number, since it uses as much as digits as its factorization.

720017 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1698.

The product of its (nonzero) digits is 98, while the sum is 17.

The square root of 720017 is about 848.5381547108. The cubic root of 720017 is about 89.6288003319.

The spelling of 720017 in words is "seven hundred twenty thousand, seventeen", and thus it is an iban number.