385038221 has 2 divisors, whose sum is σ = 385038222. Its totient is φ = 385038220.

The previous prime is 385038139. The next prime is 385038263. The reversal of 385038221 is 122830583.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 375972100 + 9066121 = 19390^2 + 3011^2 .

It is a cyclic number.

It is not a de Polignac number, because 385038221 - 2²⁶ = 317929357 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (385038821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 192519110 + 192519111.

It is an arithmetic number, because the mean of its divisors is an integer number (192519111).

Almost surely, 2^385038221 is an apocalyptic number.

It is an amenable number.

385038221 is a deficient number, since it is larger than the sum of its proper divisors (1).

385038221 is an equidigital number, since it uses as much as digits as its factorization.

385038221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11520, while the sum is 32.

The square root of 385038221 is about 19622.3908074424. The cubic root of 385038221 is about 727.5027076418.

The spelling of 385038221 in words is "three hundred eighty-five million, thirty-eight thousand, two hundred twenty-one".