238637921 has 2 divisors, whose sum is σ = 238637922. Its totient is φ = 238637920.

The previous prime is 238637899. The next prime is 238637933. The reversal of 238637921 is 129736832.

238637921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 209207296 + 29430625 = 14464^2 + 5425^2 .

It is a cyclic number.

It is not a de Polignac number, because 238637921 - 2¹⁰ = 238636897 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (238637221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 119318960 + 119318961.

It is an arithmetic number, because the mean of its divisors is an integer number (119318961).

Almost surely, 2^238637921 is an apocalyptic number.

It is an amenable number.

238637921 is a deficient number, since it is larger than the sum of its proper divisors (1).

238637921 is an equidigital number, since it uses as much as digits as its factorization.

238637921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 108864, while the sum is 41.

The square root of 238637921 is about 15447.9099233521. The cubic root of 238637921 is about 620.2686322900.

The spelling of 238637921 in words is "two hundred thirty-eight million, six hundred thirty-seven thousand, nine hundred twenty-one".