238283821 has 2 divisors, whose sum is σ = 238283822. Its totient is φ = 238283820.

The previous prime is 238283803. The next prime is 238283827. The reversal of 238283821 is 128382832.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 131905225 + 106378596 = 11485^2 + 10314^2 .

It is a cyclic number.

It is not a de Polignac number, because 238283821 - 2⁵ = 238283789 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (238283827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 119141910 + 119141911.

It is an arithmetic number, because the mean of its divisors is an integer number (119141911).

Almost surely, 2^238283821 is an apocalyptic number.

It is an amenable number.

238283821 is a deficient number, since it is larger than the sum of its proper divisors (1).

238283821 is an equidigital number, since it uses as much as digits as its factorization.

238283821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36864, while the sum is 37.

The square root of 238283821 is about 15436.4445712087. Note that the first 3 decimals coincide. The cubic root of 238283821 is about 619.9616877124.

The spelling of 238283821 in words is "two hundred thirty-eight million, two hundred eighty-three thousand, eight hundred twenty-one".