238931289 has 20 divisors (see below), whose sum is σ = 375709840. Its totient is φ = 150903000.

The previous prime is 238931281. The next prime is 238931299. The reversal of 238931289 is 982139832.

It is not a de Polignac number, because 238931289 - 2³ = 238931281 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (238931281) 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 19 ways as a sum of consecutive naturals, for example, 76087 + ... + 79164.

It is an arithmetic number, because the mean of its divisors is an integer number (18785492).

Almost surely, 2^238931289 is an apocalyptic number.

It is an amenable number.

238931289 is a deficient number, since it is larger than the sum of its proper divisors (136778551).

238931289 is a wasteful number, since it uses less digits than its factorization.

238931289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155282 (or 155273 counting only the distinct ones).

The product of its digits is 186624, while the sum is 45.

The square root of 238931289 is about 15457.4024014386. The cubic root of 238931289 is about 620.5227026289.

The spelling of 238931289 in words is "two hundred thirty-eight million, nine hundred thirty-one thousand, two hundred eighty-nine".