259687 has 4 divisors (see below), whose sum is σ = 268096. Its totient is φ = 251280.

The previous prime is 259681. The next prime is 259691. The reversal of 259687 is 786952.

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 259687 - 2¹¹ = 257639 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 (259681) 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, 4158 + ... + 4219.

It is an arithmetic number, because the mean of its divisors is an integer number (67024).

2²⁵⁹⁶⁸⁷ is an apocalyptic number.

259687 is a deficient number, since it is larger than the sum of its proper divisors (8409).

259687 is an equidigital number, since it uses as much as digits as its factorization.

259687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8408.

The product of its digits is 30240, while the sum is 37.

The square root of 259687 is about 509.5949371805. The cubic root of 259687 is about 63.7994208600.

It can be divided in two parts, 259 and 687, that added together give a triangular number (946 = T₄₃).

The spelling of 259687 in words is "two hundred fifty-nine thousand, six hundred eighty-seven".