225129240 has 256 divisors, whose sum is σ = 869299200. Its totient is φ = 50761728.

The previous prime is 225129199. The next prime is 225129241. The reversal of 225129240 is 42921522.

It is a happy number.

225129240 is a `hidden beast` number, since 22 + 512 + 92 + 40 = 666.

225129240 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (225129241) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 733167 + ... + 733473.

It is an arithmetic number, because the mean of its divisors is an integer number (3395700).

Almost surely, 2^225129240 is an apocalyptic number.

225129240 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 225129240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (434649600).

225129240 is an abundant number, since it is smaller than the sum of its proper divisors (644169960).

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

225129240 is a wasteful number, since it uses less digits than its factorization.

225129240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 431 (or 421 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 225129240 is about 15004.3073815488. The cubic root of 225129240 is about 608.3366311616.

The spelling of 225129240 in words is "two hundred twenty-five million, one hundred twenty-nine thousand, two hundred forty".