1689509836 has 24 divisors (see below), whose sum is σ = 3470346656. Its totient is φ = 704505600.

The previous prime is 1689509831. The next prime is 1689509851. The reversal of 1689509836 is 6389059861.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (1689509831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 814365 + ... + 816436.

Almost surely, 2^1689509836 is an apocalyptic number.

It is an amenable number.

1689509836 is an abundant number, since it is smaller than the sum of its proper divisors (1780836820).

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

1689509836 is a wasteful number, since it uses less digits than its factorization.

1689509836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1630849 (or 1630847 counting only the distinct ones).

The product of its (nonzero) digits is 2799360, while the sum is 55.

The square root of 1689509836 is about 41103.6474780524. The cubic root of 1689509836 is about 1191.0232556440.

The spelling of 1689509836 in words is "one billion, six hundred eighty-nine million, five hundred nine thousand, eight hundred thirty-six".