258605 has 4 divisors (see below), whose sum is σ = 310332. Its totient is φ = 206880.

The previous prime is 258581. The next prime is 258607. The reversal of 258605 is 506852.

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

It can be written as a sum of positive squares in 2 ways, for example, as 48841 + 209764 = 221^2 + 458^2 .

It is a de Polignac number, because none of the positive numbers 2^k-258605 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (258607) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 25856 + ... + 25865.

It is an arithmetic number, because the mean of its divisors is an integer number (77583).

2²⁵⁸⁶⁰⁵ is an apocalyptic number.

It is an amenable number.

258605 is a deficient number, since it is larger than the sum of its proper divisors (51727).

258605 is an equidigital number, since it uses as much as digits as its factorization.

258605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51726.

The product of its (nonzero) digits is 2400, while the sum is 26.

The square root of 258605 is about 508.5322015369. The cubic root of 258605 is about 63.7106895929.

The spelling of 258605 in words is "two hundred fifty-eight thousand, six hundred five".