1720589 has 6 divisors (see below), whose sum is σ = 1863306. Its totient is φ = 1588080.

The previous prime is 1720549. The next prime is 1720591. The reversal of 1720589 is 9850271.

It can be written as a sum of positive squares in 3 ways, for example, as 4489 + 1716100 = 67^2 + 1310^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1720589 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1720549) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4922 + ... + 5259.

It is an arithmetic number, because the mean of its divisors is an integer number (310551).

2^1720589 is an apocalyptic number.

It is an amenable number.

1720589 is a deficient number, since it is larger than the sum of its proper divisors (142717).

1720589 is a wasteful number, since it uses less digits than its factorization.

1720589 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10207 (or 10194 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 32.

The square root of 1720589 is about 1311.7122397843. The cubic root of 1720589 is about 119.8282032404.

The spelling of 1720589 in words is "one million, seven hundred twenty thousand, five hundred eighty-nine".