205278239 has 2 divisors, whose sum is σ = 205278240. Its totient is φ = 205278238.

The previous prime is 205278193. The next prime is 205278301. The reversal of 205278239 is 932872502.

205278239 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 is a cyclic number.

It is not a de Polignac number, because 205278239 - 2⁸ = 205277983 is a prime.

It is a super-2 number, since 2×205278239² = 84278310813882242, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (205278439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102639119 + 102639120.

It is an arithmetic number, because the mean of its divisors is an integer number (102639120).

Almost surely, 2^205278239 is an apocalyptic number.

205278239 is a deficient number, since it is larger than the sum of its proper divisors (1).

205278239 is an equidigital number, since it uses as much as digits as its factorization.

205278239 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 60480, while the sum is 38.

The square root of 205278239 is about 14327.5342958933. The cubic root of 205278239 is about 589.9034975748.

The spelling of 205278239 in words is "two hundred five million, two hundred seventy-eight thousand, two hundred thirty-nine".