1689008789 has 8 divisors (see below), whose sum is σ = 1822137240. Its totient is φ = 1556338176.

The previous prime is 1689008731. The next prime is 1689008833. The reversal of 1689008789 is 9878009861.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 209764 + 1688799025 = 458^2 + 41095^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1689008789 - 2⁸ = 1689008533 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 (1689008389) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 106772 + ... + 121565.

It is an arithmetic number, because the mean of its divisors is an integer number (227767155).

Almost surely, 2^1689008789 is an apocalyptic number.

It is an amenable number.

1689008789 is a deficient number, since it is larger than the sum of its proper divisors (133128451).

1689008789 is a wasteful number, since it uses less digits than its factorization.

1689008789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 228919.

The product of its (nonzero) digits is 1741824, while the sum is 56.

The square root of 1689008789 is about 41097.5521047179. The cubic root of 1689008789 is about 1190.9055059831.

The spelling of 1689008789 in words is "one billion, six hundred eighty-nine million, eight thousand, seven hundred eighty-nine".