226645 has 4 divisors (see below), whose sum is σ = 271980. Its totient is φ = 181312.

The previous prime is 226643. The next prime is 226649. The reversal of 226645 is 546622.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 546622 = 2 ⋅273311.

It can be written as a sum of positive squares in 2 ways, for example, as 106929 + 119716 = 327^2 + 346^2 .

It is a cyclic number.

It is not a de Polignac number, because 226645 - 2¹ = 226643 is a prime.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (226643) 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, 22660 + ... + 22669.

It is an arithmetic number, because the mean of its divisors is an integer number (67995).

2²²⁶⁶⁴⁵ is an apocalyptic number.

It is an amenable number.

226645 is a deficient number, since it is larger than the sum of its proper divisors (45335).

226645 is an equidigital number, since it uses as much as digits as its factorization.

226645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45334.

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

The square root of 226645 is about 476.0724734744. The cubic root of 226645 is about 60.9698857001.

The spelling of 226645 in words is "two hundred twenty-six thousand, six hundred forty-five".