1689205404 has 24 divisors (see below), whose sum is σ = 3985768080. Its totient is φ = 556741504.

The previous prime is 1689205403. The next prime is 1689205411. The reversal of 1689205404 is 4045029861.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1689205403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 789759 + ... + 791894.

It is an arithmetic number, because the mean of its divisors is an integer number (166073670).

Almost surely, 2^1689205404 is an apocalyptic number.

It is an amenable number.

1689205404 is an abundant number, since it is smaller than the sum of its proper divisors (2296562676).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1689205404 is a wasteful number, since it uses less digits than its factorization.

1689205404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1581749 (or 1581747 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 39.

The square root of 1689205404 is about 41099.9440875532. The cubic root of 1689205404 is about 1190.9517147027.

The spelling of 1689205404 in words is "one billion, six hundred eighty-nine million, two hundred five thousand, four hundred four".