238816917 has 20 divisors (see below), whose sum is σ = 364347456. Its totient is φ = 155821320.

The previous prime is 238816913. The next prime is 238816937. The reversal of 238816917 is 719618832.

238816917 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 238816917 - 2² = 238816913 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (238816913) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 27559 + ... + 35172.

Almost surely, 2^238816917 is an apocalyptic number.

238816917 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

238816917 is a deficient number, since it is larger than the sum of its proper divisors (125530539).

238816917 is an equidigital number, since it uses as much as digits as its factorization.

238816917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62790 (or 62781 counting only the distinct ones).

The product of its digits is 145152, while the sum is 45.

The square root of 238816917 is about 15453.7023719237. The cubic root of 238816917 is about 620.4236759032.

The spelling of 238816917 in words is "two hundred thirty-eight million, eight hundred sixteen thousand, nine hundred seventeen".