4423645 has 8 divisors (see below), whose sum is σ = 5408856. Its totient is φ = 3471936.

The previous prime is 4423619. The next prime is 4423649. The reversal of 4423645 is 5463244.

It can be written as a sum of positive squares in 4 ways, for example, as 142884 + 4280761 = 378^2 + 2069^2 .

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 4423645 - 2¹¹ = 4421597 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4423649) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8082 + ... + 8611.

It is an arithmetic number, because the mean of its divisors is an integer number (676107).

Almost surely, 2^4423645 is an apocalyptic number.

It is an amenable number.

4423645 is a deficient number, since it is larger than the sum of its proper divisors (985211).

4423645 is a wasteful number, since it uses less digits than its factorization.

4423645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16751.

The product of its digits is 11520, while the sum is 28.

The square root of 4423645 is about 2103.2463003652. The cubic root of 4423645 is about 164.1572579432.

Adding to 4423645 its reverse (5463244), we get a palindrome (9886889).

The spelling of 4423645 in words is "four million, four hundred twenty-three thousand, six hundred forty-five".