225243405 has 24 divisors (see below), whose sum is σ = 392692248. Its totient is φ = 119431296.

The previous prime is 225243401. The next prime is 225243407. The reversal of 225243405 is 504342522.

It is a happy number.

225243405 is a `hidden beast` number, since 2 + 252 + 4 + 3 + 405 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 66634569 + 158608836 = 8163^2 + 12594^2 .

It is not a de Polignac number, because 225243405 - 2² = 225243401 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (225243401) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6682 + ... + 22251.

It is an arithmetic number, because the mean of its divisors is an integer number (16362177).

Almost surely, 2^225243405 is an apocalyptic number.

It is an amenable number.

225243405 is a deficient number, since it is larger than the sum of its proper divisors (167448843).

225243405 is a wasteful number, since it uses less digits than its factorization.

225243405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29117 (or 29114 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 27.

The square root of 225243405 is about 15008.1113068900. Note that the first 3 decimals coincide. The cubic root of 225243405 is about 608.4394447205.

Adding to 225243405 its reverse (504342522), we get a palindrome (729585927).

The spelling of 225243405 in words is "two hundred twenty-five million, two hundred forty-three thousand, four hundred five".