259906 has 4 divisors (see below), whose sum is σ = 389862. Its totient is φ = 129952.

The previous prime is 259867. The next prime is 259907. The reversal of 259906 is 609952.

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

It can be written as a sum of positive squares in only one way, i.e., 216225 + 43681 = 465^2 + 209^2 .

It is a super-2 number, since 2×259906² = 135102257672, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (259907) by changing a digit.

259906 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64975 + ... + 64978.

2²⁵⁹⁹⁰⁶ is an apocalyptic number.

259906 is a deficient number, since it is larger than the sum of its proper divisors (129956).

259906 is a wasteful number, since it uses less digits than its factorization.

259906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129955.

The product of its (nonzero) digits is 4860, while the sum is 31.

The square root of 259906 is about 509.8097684431. The cubic root of 259906 is about 63.8173503255.

The spelling of 259906 in words is "two hundred fifty-nine thousand, nine hundred six".