687987239 has 2 divisors, whose sum is σ = 687987240. Its totient is φ = 687987238.

The previous prime is 687987199. The next prime is 687987317. The reversal of 687987239 is 932789786.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-687987239 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (687984239) 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 as a sum of consecutive naturals, namely, 343993619 + 343993620.

It is an arithmetic number, because the mean of its divisors is an integer number (343993620).

Almost surely, 2^687987239 is an apocalyptic number.

687987239 is a deficient number, since it is larger than the sum of its proper divisors (1).

687987239 is an equidigital number, since it uses as much as digits as its factorization.

687987239 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9144576, while the sum is 59.

The square root of 687987239 is about 26229.5108417980. The cubic root of 687987239 is about 882.7955344007.

The spelling of 687987239 in words is "six hundred eighty-seven million, nine hundred eighty-seven thousand, two hundred thirty-nine".