238836721 has 8 divisors (see below), whose sum is σ = 248650920. Its totient is φ = 229127808.

The previous prime is 238836713. The next prime is 238836737. The reversal of 238836721 is 127638832.

It can be written as a sum of positive squares in 4 ways, for example, as 92910321 + 145926400 = 9639^2 + 12080^2 .

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 238836721 - 2³ = 238836713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (238836781) 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, 21676 + ... + 30781.

It is an arithmetic number, because the mean of its divisors is an integer number (31081365).

Almost surely, 2^238836721 is an apocalyptic number.

It is an amenable number.

238836721 is a deficient number, since it is larger than the sum of its proper divisors (9814199).

238836721 is a wasteful number, since it uses less digits than its factorization.

238836721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52643.

The product of its digits is 96768, while the sum is 40.

The square root of 238836721 is about 15454.3431112422. The cubic root of 238836721 is about 620.4408250664.

The spelling of 238836721 in words is "two hundred thirty-eight million, eight hundred thirty-six thousand, seven hundred twenty-one".