1689659984 has 20 divisors (see below), whose sum is σ = 3327385620. Its totient is φ = 830979840.

The previous prime is 1689659969. The next prime is 1689659989. The reversal of 1689659984 is 4899569861.

It can be written as a sum of positive squares in 2 ways, for example, as 736579600 + 953080384 = 27140^2 + 30872^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1689659984.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1689659989) 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, 864629 + ... + 866580.

It is an arithmetic number, because the mean of its divisors is an integer number (166369281).

Almost surely, 2^1689659984 is an apocalyptic number.

It is an amenable number.

1689659984 is a deficient number, since it is larger than the sum of its proper divisors (1637725636).

1689659984 is a wasteful number, since it uses less digits than its factorization.

1689659984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1731278 (or 1731272 counting only the distinct ones).

The product of its digits is 33592320, while the sum is 65.

The square root of 1689659984 is about 41105.4738933880. The cubic root of 1689659984 is about 1191.0585369741.

The spelling of 1689659984 in words is "one billion, six hundred eighty-nine million, six hundred fifty-nine thousand, nine hundred eighty-four".