238694821 has 2 divisors, whose sum is σ = 238694822. Its totient is φ = 238694820.

The previous prime is 238694779. The next prime is 238694837. The reversal of 238694821 is 128496832.

238694821 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., 200081025 + 38613796 = 14145^2 + 6214^2 .

It is a cyclic number.

It is not a de Polignac number, because 238694821 - 2¹⁷ = 238563749 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (238694861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 119347410 + 119347411.

It is an arithmetic number, because the mean of its divisors is an integer number (119347411).

Almost surely, 2^238694821 is an apocalyptic number.

It is an amenable number.

238694821 is a deficient number, since it is larger than the sum of its proper divisors (1).

238694821 is an equidigital number, since it uses as much as digits as its factorization.

238694821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 165888, while the sum is 43.

The square root of 238694821 is about 15449.7514866745. The cubic root of 238694821 is about 620.3179266077.

The spelling of 238694821 in words is "two hundred thirty-eight million, six hundred ninety-four thousand, eight hundred twenty-one".