223545 has 16 divisors (see below), whose sum is σ = 408960. Its totient is φ = 102144.

The previous prime is 223543. The next prime is 223547. The reversal of 223545 is 545322.

It is an interprime number because it is at equal distance from previous prime (223543) and next prime (223547).

It is not a de Polignac number, because 223545 - 2¹ = 223543 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

223545 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (223543) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 960 + ... + 1169.

It is an arithmetic number, because the mean of its divisors is an integer number (25560).

2²²³⁵⁴⁵ is an apocalyptic number.

It is an amenable number.

223545 is a deficient number, since it is larger than the sum of its proper divisors (185415).

223545 is a wasteful number, since it uses less digits than its factorization.

223545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2144.

The product of its digits is 1200, while the sum is 21.

The square root of 223545 is about 472.8054568213. The cubic root of 223545 is about 60.6906310884.

Adding to 223545 its reverse (545322), we get a palindrome (768867).

The spelling of 223545 in words is "two hundred twenty-three thousand, five hundred forty-five".