2005729 has 4 divisors (see below), whose sum is σ = 2188080. Its totient is φ = 1823380.

The previous prime is 2005723. The next prime is 2005739. The reversal of 2005729 is 9275002.

2005729 = 422² + 423² + ... + 432².

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2005729 - 2¹¹ = 2003681 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2005723) 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, 91159 + ... + 91180.

It is an arithmetic number, because the mean of its divisors is an integer number (547020).

2^2005729 is an apocalyptic number.

It is an amenable number.

2005729 is a deficient number, since it is larger than the sum of its proper divisors (182351).

2005729 is a wasteful number, since it uses less digits than its factorization.

2005729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 182350.

The product of its (nonzero) digits is 1260, while the sum is 25.

The square root of 2005729 is about 1416.2376213051. The cubic root of 2005729 is about 126.1122917657.

It can be divided in two parts, 200 and 5729, that added together give a square (5929 = 77²).

The spelling of 2005729 in words is "two million, five thousand, seven hundred twenty-nine".