720023 has 2 divisors, whose sum is σ = 720024. Its totient is φ = 720022.

The previous prime is 720019. The next prime is 720053. The reversal of 720023 is 320027.

It is a weak prime.

It is an emirp because it is prime and its reverse (320027) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 720023 - 2² = 720019 is a prime.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (720053) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360011 + 360012.

It is an arithmetic number, because the mean of its divisors is an integer number (360012).

2⁷²⁰⁰²³ is an apocalyptic number.

720023 is a deficient number, since it is larger than the sum of its proper divisors (1).

720023 is an equidigital number, since it uses as much as digits as its factorization.

720023 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 84, while the sum is 14.

The square root of 720023 is about 848.5416901956. The cubic root of 720023 is about 89.6290492942.

It can be divided in two parts, 7200 and 23, that multiplied together give a triangular number (165600 = T₅₇₅).

The spelling of 720023 in words is "seven hundred twenty thousand, twenty-three", and thus it is an iban number.