225998 has 16 divisors (see below), whose sum is σ = 375840. Its totient is φ = 101728.

The previous prime is 225989. The next prime is 226001. The reversal of 225998 is 899522.

It is an Ulam number.

It is a nialpdrome in base 12.

It is a congruent number.

It is an unprimeable number.

225998 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

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 7 ways as a sum of consecutive naturals, for example, 9815 + ... + 9837.

It is an arithmetic number, because the mean of its divisors is an integer number (23490).

2²²⁵⁹⁹⁸ is an apocalyptic number.

225998 is a deficient number, since it is larger than the sum of its proper divisors (149842).

225998 is an equidigital number, since it uses as much as digits as its factorization.

225998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76 (or 42 counting only the distinct ones).

The product of its digits is 12960, while the sum is 35.

The square root of 225998 is about 475.3924694397. The cubic root of 225998 is about 60.9118138073.

The spelling of 225998 in words is "two hundred twenty-five thousand, nine hundred ninety-eight".