205772939 has 2 divisors, whose sum is σ = 205772940. Its totient is φ = 205772938.

The previous prime is 205772867. The next prime is 205772953. The reversal of 205772939 is 939277502.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-205772939 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 205772939.

It is not a weakly prime, because it can be changed into another prime (205772989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102886469 + 102886470.

It is an arithmetic number, because the mean of its divisors is an integer number (102886470).

Almost surely, 2^205772939 is an apocalyptic number.

205772939 is a deficient number, since it is larger than the sum of its proper divisors (1).

205772939 is an equidigital number, since it uses as much as digits as its factorization.

205772939 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 238140, while the sum is 44.

The square root of 205772939 is about 14344.7878687696. The cubic root of 205772939 is about 590.3769868770.

The spelling of 205772939 in words is "two hundred five million, seven hundred seventy-two thousand, nine hundred thirty-nine".