238188989 has 8 divisors (see below), whose sum is σ = 263165760. Its totient is φ = 214430656.

The previous prime is 238188983. The next prime is 238189013. The reversal of 238188989 is 989881832.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 238188989 - 2²⁰ = 237140413 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (238188983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 304199 + ... + 304980.

It is an arithmetic number, because the mean of its divisors is an integer number (32895720).

Almost surely, 2^238188989 is an apocalyptic number.

It is an amenable number.

238188989 is a deficient number, since it is larger than the sum of its proper divisors (24976771).

238188989 is a wasteful number, since it uses less digits than its factorization.

238188989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 609219.

The product of its digits is 1990656, while the sum is 56.

The square root of 238188989 is about 15433.3725737442. The cubic root of 238188989 is about 619.8794328512.

The spelling of 238188989 in words is "two hundred thirty-eight million, one hundred eighty-eight thousand, nine hundred eighty-nine".