1720439999 has 2 divisors, whose sum is σ = 1720440000. Its totient is φ = 1720439998.

The previous prime is 1720439989. The next prime is 1720440031. The reversal of 1720439999 is 9999340271.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1720439999 - 2¹⁶ = 1720374463 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1720439999.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1720439969) 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, 860219999 + 860220000.

It is an arithmetic number, because the mean of its divisors is an integer number (860220000).

Almost surely, 2^1720439999 is an apocalyptic number.

1720439999 is a deficient number, since it is larger than the sum of its proper divisors (1).

1720439999 is an equidigital number, since it uses as much as digits as its factorization.

1720439999 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1102248, while the sum is 53.

The square root of 1720439999 is about 41478.1870264360. The cubic root of 1720439999 is about 1198.2474414634.

The spelling of 1720439999 in words is "one billion, seven hundred twenty million, four hundred thirty-nine thousand, nine hundred ninety-nine".