719989 has 2 divisors, whose sum is σ = 719990. Its totient is φ = 719988.

The previous prime is 719981. The next prime is 720007. The reversal of 719989 is 989917.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 708964 + 11025 = 842^2 + 105^2 .

It is an emirp because it is prime and its reverse (989917) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 719989 - 2³ = 719981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (719981) 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, 359994 + 359995.

It is an arithmetic number, because the mean of its divisors is an integer number (359995).

2⁷¹⁹⁹⁸⁹ is an apocalyptic number.

It is an amenable number.

719989 is a deficient number, since it is larger than the sum of its proper divisors (1).

719989 is an equidigital number, since it uses as much as digits as its factorization.

719989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 40824, while the sum is 43.

The square root of 719989 is about 848.5216555869. The cubic root of 719989 is about 89.6276384894.

The spelling of 719989 in words is "seven hundred nineteen thousand, nine hundred eighty-nine".