225729 has 12 divisors (see below), whose sum is σ = 372736. Its totient is φ = 128952.

The previous prime is 225721. The next prime is 225733. The reversal of 225729 is 927522.

It is a happy number.

225729 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 225729 - 2³ = 225721 is a prime.

It is not an unprimeable number, because it can be changed into a prime (225721) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1729 + ... + 1854.

2²²⁵⁷²⁹ is an apocalyptic number.

It is an amenable number.

225729 is a deficient number, since it is larger than the sum of its proper divisors (147007).

225729 is a wasteful number, since it uses less digits than its factorization.

225729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3596 (or 3593 counting only the distinct ones).

The product of its digits is 2520, while the sum is 27.

The square root of 225729 is about 475.1094610719. The cubic root of 225729 is about 60.8876369219.

It can be divided in two parts, 225 and 729, that multiplied together give a square (164025 = 405²).

The spelling of 225729 in words is "two hundred twenty-five thousand, seven hundred twenty-nine".