225943990 has 16 divisors (see below), whose sum is σ = 406879200. Its totient is φ = 90337600.

The previous prime is 225943987. The next prime is 225943997. The reversal of 225943990 is 99349522.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (225943997) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 31215 + ... + 37765.

It is an arithmetic number, because the mean of its divisors is an integer number (25429950).

Almost surely, 2^225943990 is an apocalyptic number.

225943990 is a deficient number, since it is larger than the sum of its proper divisors (180935210).

225943990 is a wasteful number, since it uses less digits than its factorization.

225943990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10007.

The product of its (nonzero) digits is 174960, while the sum is 43.

The square root of 225943990 is about 15031.4333980496. The cubic root of 225943990 is about 609.0696109593.

The spelling of 225943990 in words is "two hundred twenty-five million, nine hundred forty-three thousand, nine hundred ninety".