4223540 has 12 divisors (see below), whose sum is σ = 8869476. Its totient is φ = 1689408.

The previous prime is 4223539. The next prime is 4223543. The reversal of 4223540 is 453224.

It can be written as a sum of positive squares in 2 ways, for example, as 1387684 + 2835856 = 1178^2 + 1684^2 .

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 211177 = 4223540 / (4 + 2 + 2 + 3 + 5 + 4 + 0).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4223543) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 105569 + ... + 105608.

It is an arithmetic number, because the mean of its divisors is an integer number (739123).

Almost surely, 2^4223540 is an apocalyptic number.

It is an amenable number.

4223540 is an abundant number, since it is smaller than the sum of its proper divisors (4645936).

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

4223540 is a wasteful number, since it uses less digits than its factorization.

4223540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211186 (or 211184 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 20.

The square root of 4223540 is about 2055.1253003163. The cubic root of 4223540 is about 161.6437326497.

Adding to 4223540 its reverse (453224), we get a palindrome (4676764).

The spelling of 4223540 in words is "four million, two hundred twenty-three thousand, five hundred forty".