238933509 has 4 divisors (see below), whose sum is σ = 318578016. Its totient is φ = 159289004.

The previous prime is 238933507. The next prime is 238933517. The reversal of 238933509 is 905339832.

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 238933509 - 2¹ = 238933507 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (238933507) 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, 39822249 + ... + 39822254.

It is an arithmetic number, because the mean of its divisors is an integer number (79644504).

Almost surely, 2^238933509 is an apocalyptic number.

It is an amenable number.

238933509 is a deficient number, since it is larger than the sum of its proper divisors (79644507).

238933509 is an equidigital number, since it uses as much as digits as its factorization.

238933509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79644506.

The product of its (nonzero) digits is 174960, while the sum is 42.

The square root of 238933509 is about 15457.4742115263. The cubic root of 238933509 is about 620.5246244591.

The spelling of 238933509 in words is "two hundred thirty-eight million, nine hundred thirty-three thousand, five hundred nine".