205012729 has 4 divisors (see below), whose sum is σ = 207042660. Its totient is φ = 202982800.

The previous prime is 205012723. The next prime is 205012771. The reversal of 205012729 is 927210502.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 200505600 + 4507129 = 14160^2 + 2123^2 .

It is a cyclic number.

It is not a de Polignac number, because 205012729 - 2⁷ = 205012601 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 205012697 and 205012706.

It is not an unprimeable number, because it can be changed into a prime (205012723) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1014814 + ... + 1015015.

It is an arithmetic number, because the mean of its divisors is an integer number (51760665).

Almost surely, 2^205012729 is an apocalyptic number.

It is an amenable number.

205012729 is a deficient number, since it is larger than the sum of its proper divisors (2029931).

205012729 is a wasteful number, since it uses less digits than its factorization.

205012729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2029930.

The product of its (nonzero) digits is 2520, while the sum is 28.

The square root of 205012729 is about 14318.2655723380. The cubic root of 205012729 is about 589.6490577892.

The spelling of 205012729 in words is "two hundred five million, twelve thousand, seven hundred twenty-nine".