234509 has 4 divisors (see below), whose sum is σ = 255840. Its totient is φ = 213180.

The previous prime is 234499. The next prime is 234511. The reversal of 234509 is 905432.

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 de Polignac number, because none of the positive numbers 2^k-234509 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (234529) 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, 10649 + ... + 10670.

It is an arithmetic number, because the mean of its divisors is an integer number (63960).

2²³⁴⁵⁰⁹ is an apocalyptic number.

It is an amenable number.

234509 is a deficient number, since it is larger than the sum of its proper divisors (21331).

234509 is a wasteful number, since it uses less digits than its factorization.

234509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21330.

The product of its (nonzero) digits is 1080, while the sum is 23.

The square root of 234509 is about 484.2612931053. The cubic root of 234509 is about 61.6670497501.

The spelling of 234509 in words is "two hundred thirty-four thousand, five hundred nine".