1686688867 has 4 divisors (see below), whose sum is σ = 1687478080. Its totient is φ = 1685899656.

The previous prime is 1686688853. The next prime is 1686688973. The reversal of 1686688867 is 7688866861.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1686688867 - 2¹⁵ = 1686656099 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1686688799 and 1686688808.

It is not an unprimeable number, because it can be changed into a prime (1686688067) 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, 391392 + ... + 395677.

It is an arithmetic number, because the mean of its divisors is an integer number (421869520).

Almost surely, 2^1686688867 is an apocalyptic number.

1686688867 is a deficient number, since it is larger than the sum of its proper divisors (789213).

1686688867 is an equidigital number, since it uses as much as digits as its factorization.

1686688867 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 789212.

The product of its digits is 37158912, while the sum is 64.

The square root of 1686688867 is about 41069.3178297376. The cubic root of 1686688867 is about 1190.3600038301.

The spelling of 1686688867 in words is "one billion, six hundred eighty-six million, six hundred eighty-eight thousand, eight hundred sixty-seven".