258209 has 4 divisors (see below), whose sum is σ = 295104. Its totient is φ = 221316.

The previous prime is 258197. The next prime is 258211. The reversal of 258209 is 902852.

258209 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 258209 - 2⁸ = 257953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (258299) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18437 + ... + 18450.

It is an arithmetic number, because the mean of its divisors is an integer number (73776).

2²⁵⁸²⁰⁹ is an apocalyptic number.

It is an amenable number.

258209 is a deficient number, since it is larger than the sum of its proper divisors (36895).

258209 is an equidigital number, since it uses as much as digits as its factorization.

258209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36894.

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 258209 is about 508.1426964938. The cubic root of 258209 is about 63.6781530707.

The spelling of 258209 in words is "two hundred fifty-eight thousand, two hundred nine".