258609 has 16 divisors (see below), whose sum is σ = 392000. Its totient is φ = 150336.

The previous prime is 258607. The next prime is 258611. The reversal of 258609 is 906852.

It is an interprime number because it is at equal distance from previous prime (258607) and next prime (258611).

It is not a de Polignac number, because 258609 - 2¹ = 258607 is a prime.

It is a super-2 number, since 2×258609² = 133757229762, which contains 22 as substring.

It is a Duffinian number.

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

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 567 + ... + 915.

It is an arithmetic number, because the mean of its divisors is an integer number (24500).

2²⁵⁸⁶⁰⁹ is an apocalyptic number.

It is an amenable number.

258609 is a deficient number, since it is larger than the sum of its proper divisors (133391).

258609 is a wasteful number, since it uses less digits than its factorization.

258609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 384.

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 258609 is about 508.5361344093. The cubic root of 258609 is about 63.7110180751.

The spelling of 258609 in words is "two hundred fifty-eight thousand, six hundred nine".