238921 has 2 divisors, whose sum is σ = 238922. Its totient is φ = 238920.

The previous prime is 238919. The next prime is 238939. The reversal of 238921 is 129832.

238921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 126025 + 112896 = 355^2 + 336^2 .

It is a cyclic number.

It is not a de Polignac number, because 238921 - 2¹ = 238919 is a prime.

Together with 238919, it forms a pair of twin primes.

It is an alternating number because its digits alternate between even and odd.

It is a nialpdrome in base 12.

It is not a weakly prime, because it can be changed into another prime (238991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 119460 + 119461.

It is an arithmetic number, because the mean of its divisors is an integer number (119461).

2²³⁸⁹²¹ is an apocalyptic number.

It is an amenable number.

238921 is a deficient number, since it is larger than the sum of its proper divisors (1).

238921 is an equidigital number, since it uses as much as digits as its factorization.

238921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 864, while the sum is 25.

The square root of 238921 is about 488.7954582440. The cubic root of 238921 is about 62.0513795396.

The spelling of 238921 in words is "two hundred thirty-eight thousand, nine hundred twenty-one".