238738865 has 8 divisors (see below), whose sum is σ = 287602920. Its totient is φ = 190246912.

The previous prime is 238738853. The next prime is 238738867. The reversal of 238738865 is 568837832.

It can be written as a sum of positive squares in 4 ways, for example, as 106419856 + 132319009 = 10316^2 + 11503^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 238738865 - 2⁸ = 238738609 is a prime.

It is a super-2 number, since 2×238738865² = 113992491322976450, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (238738867) 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, 91610 + ... + 94179.

It is an arithmetic number, because the mean of its divisors is an integer number (35950365).

Almost surely, 2^238738865 is an apocalyptic number.

It is an amenable number.

238738865 is a deficient number, since it is larger than the sum of its proper divisors (48864055).

238738865 is a wasteful number, since it uses less digits than its factorization.

238738865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 186051.

The product of its digits is 1935360, while the sum is 50.

The square root of 238738865 is about 15451.1768160228. The cubic root of 238738865 is about 620.3560779766.

The spelling of 238738865 in words is "two hundred thirty-eight million, seven hundred thirty-eight thousand, eight hundred sixty-five".