687832139 has 4 divisors (see below), whose sum is σ = 695560680. Its totient is φ = 680103600.

The previous prime is 687832111. The next prime is 687832151. The reversal of 687832139 is 931238786.

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 687832139 - 2²⁰ = 686783563 is a prime.

It is a super-2 number, since 2×687832139² = 946226102882630642, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 687832093 and 687832102.

It is not an unprimeable number, because it can be changed into a prime (687832339) 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 3 ways as a sum of consecutive naturals, for example, 3864137 + ... + 3864314.

It is an arithmetic number, because the mean of its divisors is an integer number (173890170).

Almost surely, 2^687832139 is an apocalyptic number.

687832139 is a deficient number, since it is larger than the sum of its proper divisors (7728541).

687832139 is an equidigital number, since it uses as much as digits as its factorization.

687832139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7728540.

The product of its digits is 435456, while the sum is 47.

The square root of 687832139 is about 26226.5540816936. The cubic root of 687832139 is about 882.7291902060.

The spelling of 687832139 in words is "six hundred eighty-seven million, eight hundred thirty-two thousand, one hundred thirty-nine".