225040340 has 72 divisors (see below), whose sum is σ = 552391560. Its totient is φ = 76785408.

The previous prime is 225040331. The next prime is 225040379. The reversal of 225040340 is 43040522.

It can be written as a sum of positive squares in 4 ways, for example, as 7300804 + 217739536 = 2702^2 + 14756^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 271046 + ... + 271874.

It is an arithmetic number, because the mean of its divisors is an integer number (7672105).

Almost surely, 2^225040340 is an apocalyptic number.

225040340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 225040340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (276195780).

225040340 is an abundant number, since it is smaller than the sum of its proper divisors (327351220).

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

225040340 is a wasteful number, since it uses less digits than its factorization.

225040340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1129 (or 1120 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 20.

The square root of 225040340 is about 15001.3446064011. The cubic root of 225040340 is about 608.2565464265.

Adding to 225040340 its reverse (43040522), we get a palindrome (268080862).

The spelling of 225040340 in words is "two hundred twenty-five million, forty thousand, three hundred forty".