205455729 has 8 divisors (see below), whose sum is σ = 276501600. Its totient is φ = 135690176.

The previous prime is 205455713. The next prime is 205455739. The reversal of 205455729 is 927554502.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 205455729 - 2⁴ = 205455713 is a prime.

It is not an unprimeable number, because it can be changed into a prime (205455739) 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 in 7 ways as a sum of consecutive naturals, for example, 319704 + ... + 320345.

It is an arithmetic number, because the mean of its divisors is an integer number (34562700).

Almost surely, 2^205455729 is an apocalyptic number.

It is an amenable number.

205455729 is a deficient number, since it is larger than the sum of its proper divisors (71045871).

205455729 is a wasteful number, since it uses less digits than its factorization.

205455729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 640159.

The product of its (nonzero) digits is 126000, while the sum is 39.

The square root of 205455729 is about 14333.7269752148. The cubic root of 205455729 is about 590.0734649495.

The spelling of 205455729 in words is "two hundred five million, four hundred fifty-five thousand, seven hundred twenty-nine".