4223645 has 8 divisors (see below), whose sum is σ = 5084856. Its totient is φ = 3367936.

The previous prime is 4223629. The next prime is 4223663. The reversal of 4223645 is 5463224.

It can be written as a sum of positive squares in 4 ways, for example, as 8836 + 4214809 = 94^2 + 2053^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 4223645 - 2⁴ = 4223629 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 569 + ... + 2961.

It is an arithmetic number, because the mean of its divisors is an integer number (635607).

Almost surely, 2^4223645 is an apocalyptic number.

It is an amenable number.

4223645 is a deficient number, since it is larger than the sum of its proper divisors (861211).

4223645 is a wasteful number, since it uses less digits than its factorization.

4223645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2751.

The product of its digits is 5760, while the sum is 26.

The square root of 4223645 is about 2055.1508460451. The cubic root of 4223645 is about 161.6450721620.

Adding to 4223645 its reverse (5463224), we get a palindrome (9686869).

The spelling of 4223645 in words is "four million, two hundred twenty-three thousand, six hundred forty-five".