205223407 has 2 divisors, whose sum is σ = 205223408. Its totient is φ = 205223406.

The previous prime is 205223377. The next prime is 205223419. The reversal of 205223407 is 704322502.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 205223407 - 2¹⁹ = 204699119 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (205223437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102611703 + 102611704.

It is an arithmetic number, because the mean of its divisors is an integer number (102611704).

Almost surely, 2^205223407 is an apocalyptic number.

205223407 is a deficient number, since it is larger than the sum of its proper divisors (1).

205223407 is an equidigital number, since it uses as much as digits as its factorization.

205223407 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3360, while the sum is 25.

The square root of 205223407 is about 14325.6206497310. The cubic root of 205223407 is about 589.8509697324.

Adding to 205223407 its reverse (704322502), we get a palindrome (909545909).

The spelling of 205223407 in words is "two hundred five million, two hundred twenty-three thousand, four hundred seven".