205740047 has 2 divisors, whose sum is σ = 205740048. Its totient is φ = 205740046.

The previous prime is 205740019. The next prime is 205740053. The reversal of 205740047 is 740047502.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 205740047 - 2⁶ = 205739983 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (205740247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102870023 + 102870024.

It is an arithmetic number, because the mean of its divisors is an integer number (102870024).

Almost surely, 2^205740047 is an apocalyptic number.

205740047 is a deficient number, since it is larger than the sum of its proper divisors (1).

205740047 is an equidigital number, since it uses as much as digits as its factorization.

205740047 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7840, while the sum is 29.

The square root of 205740047 is about 14343.6413438150. The cubic root of 205740047 is about 590.3455287162.

Adding to 205740047 its reverse (740047502), we get a palindrome (945787549).

The spelling of 205740047 in words is "two hundred five million, seven hundred forty thousand, forty-seven".