225240 has 32 divisors (see below), whose sum is σ = 676080. Its totient is φ = 60032.

The previous prime is 225227. The next prime is 225241. The reversal of 225240 is 42522.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is an Ulam number.

It is a nialpdrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (225241) 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, 819 + ... + 1058.

2²²⁵²⁴⁰ is an apocalyptic number.

225240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

225240 is an abundant number, since it is smaller than the sum of its proper divisors (450840).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

225240 is a wasteful number, since it uses less digits than its factorization.

225240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1891 (or 1887 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 15.

The square root of 225240 is about 474.5945638121. The cubic root of 225240 is about 60.8436378783.

Adding to 225240 its reverse (42522), we get a palindrome (267762).

It can be divided in two parts, 225 and 240, that added together give a triangular number (465 = T₃₀).

The spelling of 225240 in words is "two hundred twenty-five thousand, two hundred forty".