225978 has 8 divisors (see below), whose sum is σ = 451968. Its totient is φ = 75324.

The previous prime is 225977. The next prime is 225983. The reversal of 225978 is 879522.

It is a sphenic number, since it is the product of 3 distinct primes.

225978 is an admirable number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 225978.

It is not an unprimeable number, because it can be changed into a prime (225977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18826 + ... + 18837.

It is an arithmetic number, because the mean of its divisors is an integer number (56496).

2²²⁵⁹⁷⁸ is an apocalyptic number.

225978 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

225978 is a wasteful number, since it uses less digits than its factorization.

225978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37668.

The product of its digits is 10080, while the sum is 33.

The square root of 225978 is about 475.3714337231. The cubic root of 225978 is about 60.9100169297.

The spelling of 225978 in words is "two hundred twenty-five thousand, nine hundred seventy-eight".