4223745 has 20 divisors (see below), whose sum is σ = 7572180. Its totient is φ = 2252448.

The previous prime is 4223741. The next prime is 4223753. The reversal of 4223745 is 5473224.

It can be written as a sum of positive squares in 2 ways, for example, as 3207681 + 1016064 = 1791^2 + 1008^2 .

It is not a de Polignac number, because 4223745 - 2² = 4223741 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a d-powerful number, because it can be written as 4⁶ + 2³ + 2⁷ + 3⁹ + 7⁴ + 4¹¹ + 5⁵ .

4223745 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (4223741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 4810 + ... + 5619.

It is an arithmetic number, because the mean of its divisors is an integer number (378609).

Almost surely, 2^4223745 is an apocalyptic number.

4223745 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

4223745 is a deficient number, since it is larger than the sum of its proper divisors (3348435).

4223745 is a wasteful number, since it uses less digits than its factorization.

4223745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10446 (or 10437 counting only the distinct ones).

The product of its digits is 6720, while the sum is 27.

The square root of 4223745 is about 2055.1751750155. The cubic root of 4223745 is about 161.6463478674.

Adding to 4223745 its reverse (5473224), we get a palindrome (9696969).

The spelling of 4223745 in words is "four million, two hundred twenty-three thousand, seven hundred forty-five".