225638 has 16 divisors (see below), whose sum is σ = 393984. Its totient is φ = 94920.

The previous prime is 225637. The next prime is 225671. The reversal of 225638 is 836522.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (225637) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 881 + ... + 1107.

It is an arithmetic number, because the mean of its divisors is an integer number (24624).

2²²⁵⁶³⁸ is an apocalyptic number.

225638 is a deficient number, since it is larger than the sum of its proper divisors (168346).

225638 is a wasteful number, since it uses less digits than its factorization.

225638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 307.

The product of its digits is 2880, while the sum is 26.

The square root of 225638 is about 475.0136840134. The cubic root of 225638 is about 60.8794537765.

The spelling of 225638 in words is "two hundred twenty-five thousand, six hundred thirty-eight".