225646 has 8 divisors (see below), whose sum is σ = 340560. Its totient is φ = 112128.

The previous prime is 225637. The next prime is 225671. The reversal of 225646 is 646522.

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

It is a super-2 number, since 2×225646² = 101832234632, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 225646.

It is a congruent number.

It is an unprimeable 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 3 ways as a sum of consecutive naturals, for example, 295 + ... + 733.

It is an arithmetic number, because the mean of its divisors is an integer number (42570).

2²²⁵⁶⁴⁶ is an apocalyptic number.

225646 is a deficient number, since it is larger than the sum of its proper divisors (114914).

225646 is a wasteful number, since it uses less digits than its factorization.

225646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 698.

The product of its digits is 2880, while the sum is 25.

The square root of 225646 is about 475.0221047488. The cubic root of 225646 is about 60.8801732621.

The spelling of 225646 in words is "two hundred twenty-five thousand, six hundred forty-six".