258445 has 16 divisors (see below), whose sum is σ = 350208. Its totient is φ = 181440.

The previous prime is 258443. The next prime is 258449. The reversal of 258445 is 544852.

It is not a de Polignac number, because 258445 - 2¹ = 258443 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (258443) 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 15 ways as a sum of consecutive naturals, for example, 1972 + ... + 2098.

It is an arithmetic number, because the mean of its divisors is an integer number (21888).

2²⁵⁸⁴⁴⁵ is an apocalyptic number.

It is an amenable number.

258445 is a deficient number, since it is larger than the sum of its proper divisors (91763).

258445 is a wasteful number, since it uses less digits than its factorization.

258445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180.

The product of its digits is 6400, while the sum is 28.

The square root of 258445 is about 508.3748616916. The cubic root of 258445 is about 63.6975475250.

It can be divided in two parts, 258 and 445, that added together give a triangular number (703 = T₃₇).

The spelling of 258445 in words is "two hundred fifty-eight thousand, four hundred forty-five".