205401407 has 2 divisors, whose sum is σ = 205401408. Its totient is φ = 205401406.

The previous prime is 205401401. The next prime is 205401433. The reversal of 205401407 is 704104502.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 205401407 - 2¹⁰ = 205400383 is a 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 (205401401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102700703 + 102700704.

It is an arithmetic number, because the mean of its divisors is an integer number (102700704).

Almost surely, 2^205401407 is an apocalyptic number.

205401407 is a deficient number, since it is larger than the sum of its proper divisors (1).

205401407 is an equidigital number, since it uses as much as digits as its factorization.

205401407 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1120, while the sum is 23.

The square root of 205401407 is about 14331.8319484984. The cubic root of 205401407 is about 590.0214556978.

Adding to 205401407 its reverse (704104502), we get a palindrome (909505909).

The spelling of 205401407 in words is "two hundred five million, four hundred one thousand, four hundred seven".