1689871860 has 36 divisors (see below), whose sum is σ = 5125945188. Its totient is φ = 450632448.

The previous prime is 1689871759. The next prime is 1689871861. The reversal of 1689871860 is 681789861.

It can be written as a sum of positive squares in 2 ways, for example, as 1347917796 + 341954064 = 36714^2 + 18492^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a junction number, because it is equal to n+sod(n) for n = 1689871797 and 1689871806.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1689871861) 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 11 ways as a sum of consecutive naturals, for example, 4693909 + ... + 4694268.

Almost surely, 2^1689871860 is an apocalyptic number.

1689871860 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1689871860 is an abundant number, since it is smaller than the sum of its proper divisors (3436073328).

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

1689871860 is a wasteful number, since it uses less digits than its factorization.

1689871860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9388192 (or 9388187 counting only the distinct ones).

The product of its (nonzero) digits is 1161216, while the sum is 54.

The square root of 1689871860 is about 41108.0510362630. The cubic root of 1689871860 is about 1191.1083194103.

The spelling of 1689871860 in words is "one billion, six hundred eighty-nine million, eight hundred seventy-one thousand, eight hundred sixty".