1716989 has 4 divisors (see below), whose sum is σ = 1721856. Its totient is φ = 1712124.

The previous prime is 1716971. The next prime is 1716991. The reversal of 1716989 is 9896171.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1716989 - 2⁸ = 1716733 is a prime.

It is a super-2 number, since 2×1716989² = 5896102452242, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1716089) 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 in 3 ways as a sum of consecutive naturals, for example, 1859 + ... + 2624.

It is an arithmetic number, because the mean of its divisors is an integer number (430464).

2^1716989 is an apocalyptic number.

It is an amenable number.

1716989 is a deficient number, since it is larger than the sum of its proper divisors (4867).

1716989 is an equidigital number, since it uses as much as digits as its factorization.

1716989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4866.

The product of its digits is 27216, while the sum is 41.

The square root of 1716989 is about 1310.3392690445. The cubic root of 1716989 is about 119.7445724328.

The spelling of 1716989 in words is "one million, seven hundred sixteen thousand, nine hundred eighty-nine".