720727123 has 2 divisors, whose sum is σ = 720727124. Its totient is φ = 720727122.

The previous prime is 720727109. The next prime is 720727237. The reversal of 720727123 is 321727027.

It is a weak prime.

It is an emirp because it is prime and its reverse (321727027) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-720727123 is a prime.

It is not a weakly prime, because it can be changed into another prime (720727523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360363561 + 360363562.

It is an arithmetic number, because the mean of its divisors is an integer number (360363562).

Almost surely, 2^720727123 is an apocalyptic number.

720727123 is a deficient number, since it is larger than the sum of its proper divisors (1).

720727123 is an equidigital number, since it uses as much as digits as its factorization.

720727123 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8232, while the sum is 31.

The square root of 720727123 is about 26846.3614480622. The cubic root of 720727123 is about 896.5825637703.

The spelling of 720727123 in words is "seven hundred twenty million, seven hundred twenty-seven thousand, one hundred twenty-three".