259966 has 16 divisors (see below), whose sum is σ = 460800. Its totient is φ = 107640.

The previous prime is 259949. The next prime is 259967. The reversal of 259966 is 669952.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (259967) by changing a digit.

259966 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 135 + ... + 733.

It is an arithmetic number, because the mean of its divisors is an integer number (28800).

2²⁵⁹⁹⁶⁶ is an apocalyptic number.

259966 is a deficient number, since it is larger than the sum of its proper divisors (200834).

259966 is a wasteful number, since it uses less digits than its factorization.

259966 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 639.

The product of its digits is 29160, while the sum is 37.

The square root of 259966 is about 509.8686105263. The cubic root of 259966 is about 63.8222607501.

It can be divided in two parts, 259 and 966, that added together give a triangular number (1225 = T₄₉).

The spelling of 259966 in words is "two hundred fifty-nine thousand, nine hundred sixty-six".