518240729 has 2 divisors, whose sum is σ = 518240730. Its totient is φ = 518240728.

The previous prime is 518240693. The next prime is 518240741. The reversal of 518240729 is 927042815.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 473149504 + 45091225 = 21752^2 + 6715^2 .

It is a cyclic number.

It is not a de Polignac number, because 518240729 - 2¹² = 518236633 is a prime.

It is a Chen prime.

It is equal to p_27264935 and since 518240729 and 27264935 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 518240692 and 518240701.

It is not a weakly prime, because it can be changed into another prime (518240929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 259120364 + 259120365.

It is an arithmetic number, because the mean of its divisors is an integer number (259120365).

Almost surely, 2^518240729 is an apocalyptic number.

It is an amenable number.

518240729 is a deficient number, since it is larger than the sum of its proper divisors (1).

518240729 is an equidigital number, since it uses as much as digits as its factorization.

518240729 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40320, while the sum is 38.

The square root of 518240729 is about 22764.9012517076. The cubic root of 518240729 is about 803.2372621846.

The spelling of 518240729 in words is "five hundred eighteen million, two hundred forty thousand, seven hundred twenty-nine".