225391904 has 24 divisors (see below), whose sum is σ = 463034880. Its totient is φ = 107795776.

The previous prime is 225391891. The next prime is 225391921. The reversal of 225391904 is 409193522.

225391904 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 152384 + ... + 153855.

It is an arithmetic number, because the mean of its divisors is an integer number (19293120).

Almost surely, 2^225391904 is an apocalyptic number.

It is an amenable number.

225391904 is an abundant number, since it is smaller than the sum of its proper divisors (237642976).

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

225391904 is a wasteful number, since it uses less digits than its factorization.

225391904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 306272 (or 306264 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 35.

The square root of 225391904 is about 15013.0577831433. The cubic root of 225391904 is about 608.5731264745.

The spelling of 225391904 in words is "two hundred twenty-five million, three hundred ninety-one thousand, nine hundred four".