238409 has 4 divisors (see below), whose sum is σ = 246660. Its totient is φ = 230160.

The previous prime is 238397. The next prime is 238417. The reversal of 238409 is 904832.

238409 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 183184 + 55225 = 428^2 + 235^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-238409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (238439) 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, 4082 + ... + 4139.

It is an arithmetic number, because the mean of its divisors is an integer number (61665).

2²³⁸⁴⁰⁹ is an apocalyptic number.

238409 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

238409 is a deficient number, since it is larger than the sum of its proper divisors (8251).

238409 is an equidigital number, since it uses as much as digits as its factorization.

238409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8250.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 238409 is about 488.2714409015. The cubic root of 238409 is about 62.0070231378.

The spelling of 238409 in words is "two hundred thirty-eight thousand, four hundred nine".