205389047 has 2 divisors, whose sum is σ = 205389048. Its totient is φ = 205389046.

The previous prime is 205389017. The next prime is 205389071. The reversal of 205389047 is 740983502.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 205389047 - 2⁶ = 205388983 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 205389047.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (205389007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102694523 + 102694524.

It is an arithmetic number, because the mean of its divisors is an integer number (102694524).

Almost surely, 2^205389047 is an apocalyptic number.

205389047 is a deficient number, since it is larger than the sum of its proper divisors (1).

205389047 is an equidigital number, since it uses as much as digits as its factorization.

205389047 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 205389047 is about 14331.4007340525. The cubic root of 205389047 is about 590.0096206417.

The spelling of 205389047 in words is "two hundred five million, three hundred eighty-nine thousand, forty-seven".