238309 has 4 divisors (see below), whose sum is σ = 239904. Its totient is φ = 236716.

The previous prime is 238307. The next prime is 238313. The reversal of 238309 is 903832.

It is a happy number.

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 238309 - 2¹ = 238307 is a prime.

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

It is a Duffinian number.

238309 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (238307) 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, 547 + ... + 880.

It is an arithmetic number, because the mean of its divisors is an integer number (59976).

2²³⁸³⁰⁹ is an apocalyptic number.

It is an amenable number.

238309 is a deficient number, since it is larger than the sum of its proper divisors (1595).

238309 is a wasteful number, since it uses less digits than its factorization.

238309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1594.

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 238309 is about 488.1690281040. The cubic root of 238309 is about 61.9983523669.

The spelling of 238309 in words is "two hundred thirty-eight thousand, three hundred nine".