259998 has 16 divisors (see below), whose sum is σ = 550800. Its totient is φ = 81536.

The previous prime is 259993. The next prime is 260003. The reversal of 259998 is 899952.

It is an interprime number because it is at equal distance from previous prime (259993) and next prime (260003).

It is an Ulam number.

It is a Curzon number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 259998.

It is not an unprimeable number, because it can be changed into a prime (259991) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1173 + ... + 1376.

It is an arithmetic number, because the mean of its divisors is an integer number (34425).

2²⁵⁹⁹⁹⁸ is an apocalyptic number.

259998 is an abundant number, since it is smaller than the sum of its proper divisors (290802).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

259998 is a wasteful number, since it uses less digits than its factorization.

259998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2571.

The product of its digits is 58320, while the sum is 42.

The square root of 259998 is about 509.8999901942. The cubic root of 259998 is about 63.8248793342.

The spelling of 259998 in words is "two hundred fifty-nine thousand, nine hundred ninety-eight".