1689199687 has 6 divisors (see below), whose sum is σ = 1964987448. Its totient is φ = 1447885404.

The previous prime is 1689199643. The next prime is 1689199717. The reversal of 1689199687 is 7869919861.

It is a de Polignac number, because none of the positive numbers 2^k-1689199687 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 (1689199987) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 17236683 + ... + 17236780.

It is an arithmetic number, because the mean of its divisors is an integer number (327497908).

Almost surely, 2^1689199687 is an apocalyptic number.

1689199687 is a deficient number, since it is larger than the sum of its proper divisors (275787761).

1689199687 is an equidigital number, since it uses as much as digits as its factorization.

1689199687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34473477 (or 34473470 counting only the distinct ones).

The product of its digits is 11757312, while the sum is 64.

The square root of 1689199687 is about 41099.8745375214. The cubic root of 1689199687 is about 1190.9503711364.

The spelling of 1689199687 in words is "one billion, six hundred eighty-nine million, one hundred ninety-nine thousand, six hundred eighty-seven".