235209 has 16 divisors (see below), whose sum is σ = 348992. Its totient is φ = 139968.

The previous prime is 235199. The next prime is 235211. The reversal of 235209 is 902532.

It is not a de Polignac number, because 235209 - 2⁵ = 235177 is a prime.

It is a Duffinian number.

235209 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (235289) 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, 1362 + ... + 1524.

It is an arithmetic number, because the mean of its divisors is an integer number (21812).

2²³⁵²⁰⁹ is an apocalyptic number.

It is an amenable number.

235209 is a deficient number, since it is larger than the sum of its proper divisors (113783).

235209 is a wasteful number, since it uses less digits than its factorization.

235209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 216.

The product of its (nonzero) digits is 540, while the sum is 21.

The square root of 235209 is about 484.9835048741. The cubic root of 235209 is about 61.7283466944.

It can be divided in two parts, 235 and 209, that added together give a palindrome (444).

The spelling of 235209 in words is "two hundred thirty-five thousand, two hundred nine".