259866 has 12 divisors (see below), whose sum is σ = 563082. Its totient is φ = 86616.

The previous prime is 259841. The next prime is 259867. The reversal of 259866 is 668952.

259866 is a `hidden beast` number, since 2 + 598 + 66 = 666.

It can be written as a sum of positive squares in only one way, i.e., 221841 + 38025 = 471^2 + 195^2 .

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 259866.

It is not an unprimeable number, because it can be changed into a prime (259867) by changing a digit.

259866 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 5 ways as a sum of consecutive naturals, for example, 7201 + ... + 7236.

2²⁵⁹⁸⁶⁶ is an apocalyptic number.

259866 is an abundant number, since it is smaller than the sum of its proper divisors (303216).

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

259866 is a wasteful number, since it uses less digits than its factorization.

259866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14445 (or 14442 counting only the distinct ones).

The product of its digits is 25920, while the sum is 36.

The square root of 259866 is about 509.7705366143. The cubic root of 259866 is about 63.8140762893.

The spelling of 259866 in words is "two hundred fifty-nine thousand, eight hundred sixty-six".